Malicious PDF — malware analysis report

Static analysis result for SHA-256 1031df9bc8e09abc…

MALICIOUS

PDF

43.7 KB Created: 2020-08-07 04:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4838cc3bd695ca8d0ab671c836e6220f SHA-1: 1e664510aee03d6df4b047ac45f37844c90e12c8 SHA-256: 1031df9bc8e09abc0de62386610c0072c27cc923ee4619f69f71d2b01aa1c80d
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious. The embedded URL in the document body, 'https://ttraff.cc/pify?keyword=christianity+and+autosuggestion+pdf', is the primary IOC.

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=christianity+and+autosuggestion+pdf
    • http://files.mgmband.com/uploads/1/3/0/9/130970016/guxibovaw_jesubikurexo_gigek.pdf
    • http://files.biophysical-ecology.com/uploads/1/3/1/4/131406356/xivut_girusidusowele_finusagon.pdf
    • http://files.bunchwashington.com/uploads/1/3/0/7/130740178/dekefapexodawo_bobapuz_wanufisufukewe_tebiza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/8100/6244/files/cloud_atlas_sextet_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/93241806760.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7006/files/free_p2p_blocklist.pdf
    • https://cdn.shopify.com/s/files/1/0438/4984/2850/files/70280936695.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dijupabexapuvasazanuripik.pdf
    • https://cdn.shopify.com/s/files/1/0436/4258/5241/files/jupiter_the_bringer_of_jollity.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/vapebosumutazu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8280/files/63428203207.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/turkish_march_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/9243/5359/files/reasons_for_the_abolishment_of_slave_trade.pdf
    • https://cdn.shopify.com/s/files/1/0437/6687/4266/files/29291621147.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_off00005ef1.bin
3b9abf9f7960c4957792e6787a7c3bf838a4fac9f785434b2a70141a0f18166f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF1 5280 bytes
font_01_sfnt_off000070e5.bin
630acdc0dfc0b52915424266098f3c551ceb0739f3ca831901abe8afef2e8969		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70E5 10288 bytes
font_02_sfnt_off00009406.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9406 4324 bytes

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