Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41d98529c7018d7…

MALICIOUS

PDF

42.3 KB Created: 2020-08-31 21:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ef1005b2924197137ee9485a96dc0b3 SHA-1: c824c4beba181011954da148cb500da43697c2d8 SHA-256: a41d98529c7018d71cbfe696e9e17c93641d12db882576fdc2f61dced2e79fec
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, disguised with a plausible article title. This indicates an attempt to direct users to a malicious site, likely for phishing or malware distribution. The PDF also contains a large number of external links, many pointing to Shopify-hosted PDFs, suggesting a link farm or content stuffing technique to improve search engine ranking and potentially mask malicious activity. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is a strong indicator of malicious intent.

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=curse+of+oak+island+episode+guide+wiki
    • https://static.usrfiles.com/ugd/c7ef1a_2cc3635b0bad4ddaba177f7593500477.pdf
    • https://static.usrfiles.com/ugd/12745a_a419495060bf4ccfa597173f8fbffc87.pdf
    • https://static.usrfiles.com/ugd/21e6f2_f5f0871d3ada4fdb8ace2ff966451fdb.pdf
    • https://static.usrfiles.com/ugd/756799_afdd0f351bb44d02b2cc4d0d80dbf219.pdf
    • https://cdn.shopify.com/s/files/1/0436/7872/8345/files/alimentation_ctogne.pdf
    • https://cdn.shopify.com/s/files/1/0434/2241/7047/files/battleground_crossbows_and_catapults_rules.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/wejarujokijivepexidan.pdf
    • https://cdn.shopify.com/s/files/1/0429/6753/1673/files/lurixugik.pdf
    • https://cdn.shopify.com/s/files/1/0436/9989/6475/files/newspaper_template_publisher_2016.pdf
    • https://cdn.shopify.com/s/files/1/0434/8923/1000/files/apprendre_l_allemand_niveau_a1.pdf
    • https://cdn.shopify.com/s/files/1/0435/7813/0593/files/3724826472.pdf
    • https://cdn.shopify.com/s/files/1/0434/5099/0753/files/wurewuwajotobu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0756/6239/files/earthing_calculation_formula.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/wadexovefewopixejuwiv.pdf
    • https://static.usrfiles.com/ugd/fbccce_de572cac14a54e76a8ab5ccf8f3d7b03.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3cddb0cad2f4dfdb061d0873098eabd.pdf
    • https://static.usrfiles.com/ugd/74a852_de68c7e3bc5c479d8cc6db44438480d0.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_off00005a0f.bin
babdadde8a4eaa9c21b2ab44d94997324b58d9733935a95104d40efb22925e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A0F 5192 bytes
font_01_sfnt_off00006bd6.bin
e9b2acf504d12d932974d2ff32cf8027f9e5edf8469b5f7821c5d01dd0319747		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD6 10096 bytes
font_02_sfnt_off00008dd1.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD1 4324 bytes

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