Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff792af738fab58…

MALICIOUS

PDF

70.7 KB Created: 2020-08-24 12:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1a1b203944863b7afac7125af9586297 SHA-1: 7676f02a40a30dcfc6523ca1e528626c225eee1a SHA-256: 5ff792af738fab58b8a99b10793ba7f727bcaa321024709ba1284428a9b306e3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to a known malicious domain, identified as a redirector for SEO link farms. The document body, though heavily obfuscated, contains text related to 'Prokaryote vs eukaryote worksheet pdf' and the malicious URL, suggesting a phishing or scam lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=prokaryote+vs+eukaryote+worksheet+pdf In PDF document text
    • http://files.spacesrp.com/uploads/1/3/2/8/132814071/tokazifup.pdfIn PDF document text
    • http://files.apof.eu/uploads/1/3/1/6/131606984/6197172.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0683/4334/files/asymmetric_information_market_failure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9915/2799/files/18085962115.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4567/3377/files/full_body_workout_routine_for_weight_loss_at_home.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/7426730475.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8037/5710/files/pimenojiwakaxulejupibaxir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4389/5966/files/sajobibi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6699/0502/files/71433318917.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29883534071.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/jemorig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/backwards_and_forwards_david_ball_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5802/6904/files/84789729676.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/dugimitovuxene.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7175/6698/files/cebuano_mass_songs_lyrics_and_chords.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
🗂 Part of campaign: apof.eu 4 samples

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEA 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off0000d6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 5416 bytes
SHA-256: 8b8636fb5b42d93d89a85adb01514ac60eb707a878d77d0f7ec3d3c08abdc82a
font_02_sfnt_off0000e962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE962 9932 bytes
SHA-256: 7cf5ca6e2c17c3d8e5a1e781cf00b08667fe50903ada0026cab0b025a6669b37

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