Malicious PDF — malware analysis report

Static analysis result for SHA-256 138477eefd6bf93b…

MALICIOUS

PDF

44.1 KB Created: 2020-08-21 16:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6b685dd38cb5a2b5b3c124ae3bd1cd6 SHA-1: 5c0ce9997b584965b63eb30cfb9a1b01968a249d SHA-256: 138477eefd6bf93b1a63e3eaf8e756312d3a90dc00fc9837c7b8728cb71d7bb6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=birthday+wishes+images+with+quotes'. The document body, though heavily obfuscated, contains this URL and numerous other links to PDF files hosted on Shopify and other domains, suggesting a link farm or redirection scheme. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be a lure to a malicious site, likely for phishing or scamming purposes.

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=birthday+wishes+images+with+quotes
    • http://litobofu.southmadisonunite.org/uploads/1/3/1/4/131409236/tamirodetew.pdf
    • http://vuzaluki.ibmc-la.org/uploads/1/3/2/6/132681670/ddb93.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/6252/4069/files/albinism_in_humans.pdf
    • https://cdn.shopify.com/s/files/1/0432/6440/9755/files/wovadenu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4085/0598/files/18316200953.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/77541345445.pdf
    • https://cdn.shopify.com/s/files/1/0430/7697/6791/files/zimadejizikexanatexot.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1142/files/36203745002.pdf
    • https://cdn.shopify.com/s/files/1/0452/5637/6480/files/ecology_biotic_and_abiotic_factors.pdf
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/fetodatabopegevedenetut.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/vexotazivukajudiku.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/81758920839.pdf
    • https://cdn.shopify.com/s/files/1/0436/8538/0246/files/mutita.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/17255374548.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4719/files/hydrochloric_acid_msds_sigma_aldrich.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060de.bin
b5960a26c378a843f2430ae770e1336a502691f490d54921d500c8c1700baea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60DE 5352 bytes
font_01_sfnt_off00007320.bin
ac663345b9079f6e79486f18e2fa026f404a502948878c1e72aaf67a68275d25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7320 9992 bytes
font_02_sfnt_off00009554.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9554 4324 bytes

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