Malicious PDF — malware analysis report

Static analysis result for SHA-256 33527a086362875a…

MALICIOUS

PDF

41.1 KB Created: 2020-08-19 11:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18794d8c813e2cd0256cfeb43c1c9336 SHA-1: fbde40f27bd4466b5138f0a3056b5a886129b35e SHA-256: 33527a086362875aab906e96dd5a3b3a66cfc38aa07880e055f0f6f95c128464
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One prominent link, 'https://ttraff.ru/pify?keyword=sophos+endpoint+protection+mac+installation+guide', is identified as a malicious redirector. This suggests the document's primary purpose is to trick users into visiting malicious infrastructure by masquerading as a legitimate software installation guide. No scripts were extracted from this sample.

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.ru/pify?keyword=sophos+endpoint+protection+mac+installation+guide
    • http://files.artoftragedy.com/uploads/1/3/2/6/132683014/domudu_kogumuxezomusir_xediko.pdf
    • http://ruxow.authenticnutritioncoach.com/uploads/1/3/0/7/130740178/3279786.pdf
    • http://files.customdecorativemetalwork.com/uploads/1/3/1/8/131856330/nelitufaxulilev.pdf
    • http://files.texassaddlefitter.com/uploads/1/3/1/0/131070498/6395825.pdf
    • https://cdn.shopify.com/s/files/1/0435/2360/4631/files/guia_de_canales_movistar_peru_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0681/1560/files/solodusozirotaziwalo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8373/4943/files/viruses_and_other_malicious_code.pdf
    • https://cdn.shopify.com/s/files/1/0432/8197/3403/files/kohler_magnum_18.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/pejadebavetodimazojififa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9332/files/william_gillock_autumn_sketch.pdf
    • https://cdn.shopify.com/s/files/1/0437/9423/5553/files/alice_in_wonderland_original_text.pdf
    • https://cdn.shopify.com/s/files/1/0431/1869/0458/files/bajekotuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/89371382060.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/jefipovagizejokejukipe.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_off0000618d.bin
12953bee7f064efec79262e8a59728b297e99d44b8f946d2376a354c60638109
pdf-font-stream PDF embedded font (sfnt) at offset 0x618D 5592 bytes
font_01_sfnt_off00007457.bin
6a109cec0e861b93b49429933a16e0d05231d46063d6daac9570e70a7a492b08
pdf-font-stream PDF embedded font (sfnt) at offset 0x7457 10280 bytes