Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82c256dca9c3055…

MALICIOUS

PDF

46.3 KB Created: 2020-08-10 01:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb922fc4a9c84432f39bf4b60e82f96b SHA-1: 10440a781125a4448920db3fb6de1f5ee0329eab SHA-256: c82c256dca9c3055f6cb8f24e3f3573fbc6d5d778f3952a82c3700e633e7c314
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'simple business plan outline pdf' and includes the malicious URL. The presence of a large number of external PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content.

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=simple+business+plan+outline+pdf
    • http://files.elizabethbernays.com/uploads/1/3/0/7/130739712/pewolobo.pdf
    • http://files.thedenplay.com/uploads/1/3/0/7/130739169/8987737.pdf
    • http://files.readersbeware.com/uploads/1/3/1/3/131383982/e3411873769a4.pdf
    • https://cdn.shopify.com/s/files/1/0439/6027/1006/files/ch_ella_mi_creda_libero_e_lontano.pdf
    • https://cdn.shopify.com/s/files/1/0455/7688/0293/files/flowers_for_algernon_full_novel.pdf
    • https://cdn.shopify.com/s/files/1/0432/3016/7203/files/blackjack_chart.pdf
    • https://cdn.shopify.com/s/files/1/0438/8772/2648/files/beximu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8932/1366/files/call_forwarding_android.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/83166739278.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/red_like_roses_part_2_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/5679/0695/files/gupixugirejovitutupibuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6949/files/78159062377.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1702/files/add_local_repo_to_github.pdf
    • https://cdn.shopify.com/s/files/1/0431/4398/7357/files/wordly_wise_3000_book_6_lesson_4_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0436/7230/5817/files/jukodow.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_off000069d8.bin
f8f1413bc55bfeddcfaf1932f52ae0b39d8986abf2320a40cfaa6c6da70dcaa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69D8 5216 bytes
font_01_sfnt_off00007b70.bin
b2592c1d1f6738cfed817124a841e1ebcd5da52871ff0c32c0ea74b2c9ba8e89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B70 10180 bytes
font_02_sfnt_off00009e38.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E38 4324 bytes

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