Malicious PDF — malware analysis report

Static analysis result for SHA-256 0253f95f2a52b60d…

MALICIOUS

PDF

62.8 KB Created: 2020-08-17 04:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78382ea5abc219f688774c8bb418b73c SHA-1: 1c01876a0aa004bac70791c5585471019f49624a SHA-256: 0253f95f2a52b60d8705c44e190c7b77679ce7c6f1ecd138d9963a6eacef7895
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=composition+and+inverses+of+functions+worksheet+pdf'. Additionally, it features a large number of embedded links to PDF files, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to a worksheet and the malicious URL, reinforcing the lure.

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.cc/pify?keyword=composition+and+inverses+of+functions+worksheet+pdf
    • http://files.tifillinois.com/uploads/1/3/0/7/130775331/semopawefowo.pdf
    • http://files.brodyquixote.com/uploads/1/3/1/3/131381540/1353035.pdf
    • http://files.bytheslicegourmetdesserts.com/uploads/1/3/0/8/130813325/tajogatexoro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/dukufedokivexisewaposad.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/tagibotavuposopotofe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0452/5720/files/synaptics_for_windows_10_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0434/1730/5240/files/rirofesopelamagifuliki.pdf
    • https://cdn.shopify.com/s/files/1/0449/8400/8862/files/45604841478.pdf
    • https://cdn.shopify.com/s/files/1/0434/5783/9254/files/52686688535.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/zixufikolalefazavakogip.pdf
    • https://cdn.shopify.com/s/files/1/0432/9170/5500/files/boschveld_farming.pdf
    • https://cdn.shopify.com/s/files/1/0434/0393/5900/files/780307362.pdf
    • https://cdn.shopify.com/s/files/1/0430/4958/2743/files/503601527.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71895612735.pdf
    • https://cdn.shopify.com/s/files/1/0435/4726/3131/files/66767921136.pdf
    • https://cdn.shopify.com/s/files/1/0431/0781/1495/files/organic_chemistry_5th_edition_solutions_manual.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009f67.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F67 2828 bytes
font_01_sfnt_off0000a961.bin
e6a7afd0b449c32369fa2692baef6e7a17d33dea388d668d350602d493648fc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA961 5484 bytes
font_02_sfnt_off0000bbf3.bin
c5d09e3700281579689c76fdc0d762a70bad301ceaaff924bbef304b9d67ed05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF3 10260 bytes
font_03_sfnt_off0000defc.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 4324 bytes

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