Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e83100c4966cf53…

MALICIOUS

PDF

47.4 KB Created: 2020-08-04 05:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c076bee3ec95af7e7f01e48ebab522b SHA-1: 10ed099a5c319aaa9575be4d2897a35cf2ceb141 SHA-256: 1e83100c4966cf5340f60003d972c67b739e984c9062558792070fb6fe926906
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links that point to a redirector service, which is a common technique for distributing malware or phishing pages. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.com/pify?keyword=basic+accounting+books+pdf as malicious. The document body, though heavily obfuscated, contains this same URL, reinforcing the malicious intent. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=basic+accounting+books+pdf
    • http://files.tanawanhandycraft.com/uploads/1/3/0/8/130813953/8668ba.pdf
    • http://files.aedutah.com/uploads/1/3/1/4/131453045/guposigizose.pdf
    • http://files.ridleyea.org/uploads/1/3/1/3/131380558/c8ade44.pdf
    • https://cdn.shopify.com/s/files/1/0437/6854/5441/files/39310783329.pdf
    • https://cdn.shopify.com/s/files/1/0428/0729/6163/files/59625292334.pdf
    • https://cdn.shopify.com/s/files/1/0434/1186/5751/files/java_recursive_example.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/tugiboxugujarutudugoli.pdf
    • https://cdn.shopify.com/s/files/1/0436/3878/4158/files/80063340872.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vibemegabixowosepabotabux.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/14958271244.pdf
    • https://cdn.shopify.com/s/files/1/0430/1848/5923/files/king_of_fighters_13_sprites.pdf
    • https://cdn.shopify.com/s/files/1/0433/6504/0286/files/gezupupawaluladeneberonag.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4340/files/rukebulax.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/jamawakamilosux.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6566/files/luliseviwafixag.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065ea.bin
202e2ded73320e774687e06214d953cef1a27192b5a178b08d804a5130037a6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65EA 5212 bytes
font_01_sfnt_off000077a7.bin
7c05166fa5cf4cd7513cd910b051f0b15cb80ae5f9e306c68fb5d83be9ea19f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A7 13780 bytes
font_02_sfnt_off0000a2b4.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2B4 4324 bytes

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