Malicious PDF — malware analysis report

Static analysis result for SHA-256 042dd84ddadfc9dd…

MALICIOUS

PDF

40.9 KB Created: 2020-08-06 21:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcb297a2f4b6fe6c06a417e23030e7a1 SHA-1: 086f54e4abec5621ca6ace1d947fed48bfdcd7a4 SHA-256: 042dd84ddadfc9dd2d96f2e4fe234120f752eb39235212b9517b00a736434815
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, suggesting an attempt to create an SEO link farm. One prominent URL, 'https://ttraff.com/pify?keyword=area+of+composite+rectangles+worksheet+pdf', is identified as a malicious redirector. This indicates the document's primary purpose is to redirect users to potentially malicious content, likely for phishing or malware distribution.

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=area+of+composite+rectangles+worksheet+pdf
    • http://files.davesartdimensions.com/uploads/1/3/1/6/131606348/vojetiborakupo.pdf
    • http://files.johnscreekchorus.com/uploads/1/3/1/6/131637136/d78bb5c70da.pdf
    • http://files.nemnlc.org/uploads/1/3/1/3/131380728/lujixalut.pdf
    • http://files.justguystravel.com/uploads/1/3/1/3/131398547/256f3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3304/2839/files/fe_mechanical_review_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/21671569229.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7963/files/786_380_6798.pdf
    • https://cdn.shopify.com/s/files/1/0436/5382/4677/files/wowezejogosojumit.pdf
    • https://cdn.shopify.com/s/files/1/0433/9990/5429/files/56728720182.pdf
    • https://cdn.shopify.com/s/files/1/0432/5556/2398/files/ripiroporomokokolavuk.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/kekeket.pdf
    • https://cdn.shopify.com/s/files/1/0434/5538/1669/files/nabokolovifuniditiworukuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8266/files/vixota.pdf
    • https://cdn.shopify.com/s/files/1/0437/7149/4554/files/632761784.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/sale_of_business_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0430/0580/4698/files/lolekibu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1351/2100/files/teroxuve.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060f3.bin
4a18c75c6ed8e718f816169fd49b0f45bfa49f5721f7e57edb90ce5a488c5bd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F3 5712 bytes
font_01_sfnt_off00007447.bin
cbecc088c7fecd5a36208c7e58d72f9afd3fce8624050deb1591983d36d5794b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7447 9960 bytes

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