Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e629e8ad6267cc…

MALICIOUS

PDF

41.0 KB Created: 2020-08-14 00:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbcd27f099070d1843d2d17c64b6a097 SHA-1: 6b19eb17f3f2149a32403678864e49eea9dac7aa SHA-256: 68e629e8ad6267cc0fb19a07749a8cca9b54b7e129acdab7c6852582e349c62f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure at ttraff.com. The document body, though heavily obfuscated, contains text suggesting a lure related to 'learning english beginner level pdf'. The presence of many external PDF links indicates a link farm or SEO manipulation tactic. No scripts were extracted, but the embedded URLs and heuristic firings strongly suggest a phishing or redirection attempt.

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=learning+english+beginner+level+pdf
    • http://files.twiggsconsulting.com/uploads/1/3/2/7/132741334/98d1c09f8309b23.pdf
    • http://files.spencergroupinc.com/uploads/1/3/0/8/130874043/13accbe.pdf
    • http://vulifor.thecountryovenbakery.com/uploads/1/3/0/8/130815026/nisil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1321/8199/files/xufapabobo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ziduvawijixivobufanevi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/98330551139.pdf
    • https://cdn.shopify.com/s/files/1/0430/1943/6195/files/thinking_in_java_filetype.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/loxaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/7437/8142/files/language_analysis_articles.pdf
    • https://cdn.shopify.com/s/files/1/0429/7742/7609/files/zisinowinojironizilo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/learn_sql_tutorials_point.pdf
    • https://cdn.shopify.com/s/files/1/0437/1664/0923/files/puwobubegofit.pdf
    • https://cdn.shopify.com/s/files/1/0435/1927/9258/files/66608710772.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/kuzidibelizaxima.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/marvel_future_fight_apk_data_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/usmc_uniform_inspection_sheet.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_off0000609d.bin
67f50706ee8150f974aeec122192e69c1bb2f3392c697686256f6ab534348619		 pdf-font-stream PDF embedded font (sfnt) at offset 0x609D 5444 bytes
font_01_sfnt_off00007315.bin
70eadb2ba42c21af6b8035118ea3543e5e2b2dc9ae1b1983b2555ec054623936		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7315 10552 bytes

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