Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc28d0311f60d808…

MALICIOUS

PDF

38.6 KB Created: 2020-08-12 21:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17ebb73890a7a7cab72b87ed761037bb SHA-1: c59742ac734d0cd37f485c60161c19d8d2c5f8dc SHA-256: bc28d0311f60d80830a12a8bd77c1db167621afeac112d9f227417a28078a00f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that appears to be part of a link farm designed to trick users into downloading files. The document body, though heavily obfuscated, contains text related to a free PDF download, reinforcing the lure. The presence of numerous external links, many hosted on Shopify, suggests a campaign to distribute malicious content disguised as legitimate documents.

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=alter+ego+a1+cahier+d+activit%25C3%25A9s+pdf+free+download
    • http://files.kgraykaliana.com/uploads/1/3/1/6/131606396/sigomowup.pdf
    • http://mubek.binhamvillagehall.co.uk/uploads/1/3/2/7/132710714/peferixoxiludij_tubakufadaka_posavosemodeso.pdf
    • http://files.adelanteknox.org/uploads/1/3/1/4/131437005/bokar.pdf
    • http://files.mrsthompsonteaches.com/uploads/1/3/0/7/130739173/vukemoba.pdf
    • http://files.cinnamongirlpurebotanicals.com/uploads/1/3/1/1/131164520/3411592.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vatajimawi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/xevapixusalopoleguf.pdf
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/58994360461.pdf
    • https://cdn.shopify.com/s/files/1/0433/4541/2261/files/gopixakagaxunowubiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9674/files/93071815250.pdf
    • https://cdn.shopify.com/s/files/1/0434/1835/3815/files/78553114630.pdf
    • https://cdn.shopify.com/s/files/1/0436/2013/9170/files/xujuwijegegivugaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tagesagebog.pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7467/files/jekiribepok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdf
    • https://cdn.shopify.com/s/files/1/0428/4484/8295/files/26029432605.pdf
    • https://cdn.shopify.com/s/files/1/0428/6673/7311/files/fivunuxileji.pdf
    • https://cdn.shopify.com/s/files/1/0435/4356/0346/files/64575456896.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005449.bin
646fffd97606d92aba29c026615d6e279a47f701d1a5a63b6725e894588d9085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5449 5752 bytes
font_01_sfnt_off000067a7.bin
20ece8921ffb695e7851aad5a66983feac17515096d8ec78880d77bb2c618225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A7 11048 bytes

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