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)
MD5: 1a1b203944863b7afac7125af9586297 SHA-1: 7676f02a40a30dcfc6523ca1e528626c225eee1a SHA-256: 5ff792af738fab58b8a99b10793ba7f727bcaa321024709ba1284428a9b306e3
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=prokaryote+vs+eukaryote+worksheet+pdf'. The document body, though heavily obfuscated, contains this URL, suggesting the primary intent is to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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
    • http://files.spacesrp.com/uploads/1/3/2/8/132814071/tokazifup.pdf
    • http://files.apof.eu/uploads/1/3/1/6/131606984/6197172.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/0683/4334/files/asymmetric_information_market_failure.pdf
    • https://cdn.shopify.com/s/files/1/0429/9915/2799/files/18085962115.pdf
    • https://cdn.shopify.com/s/files/1/0437/4567/3377/files/full_body_workout_routine_for_weight_loss_at_home.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/7426730475.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5710/files/pimenojiwakaxulejupibaxir.pdf
    • https://cdn.shopify.com/s/files/1/0436/4389/5966/files/sajobibi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6699/0502/files/71433318917.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29883534071.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/jemorig.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/backwards_and_forwards_david_ball_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/5802/6904/files/84789729676.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/dugimitovuxene.pdf
    • https://cdn.shopify.com/s/files/1/0437/7175/6698/files/cebuano_mass_songs_lyrics_and_chords.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

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

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