Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fdff1091c89f32…

MALICIOUS

PDF

42.8 KB Created: 2020-08-22 04:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbed801fb7abd05d53671d5019e84ae9 SHA-1: 7d4f15fccd2d0a0c4f95e763f2321456b7961a8e SHA-256: 82fdff1091c89f3253444d6d22b88545184dd9c039c328fc1053dc8aa576d987
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a vehicle owner's manual. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which is likely used to deliver a secondary payload.

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=2017+chevy+impala+premier+owners+manual
    • http://sinopix.mycolrd.com/uploads/1/3/1/8/131858419/5525372.pdf
    • http://files.ywtc.ca/uploads/1/3/2/6/132681201/zorujasede-xedejob-gapelosoburofut.pdf
    • http://files.deletealcohol.co.uk/uploads/1/3/1/1/131164460/rireviliz-sogaded-robobubelisizim-ranikaxupaluj.pdf
    • http://files.slavuta-stylist.com/uploads/1/3/1/6/131606431/jukirig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6163/3439/files/abecedario_para_colorear_con_dibujos.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/analytical_writing_sample_essays.pdf
    • https://cdn.shopify.com/s/files/1/0437/3318/8762/files/padaxugenidabutefowiwira.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/54786434804.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4274895189.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zaduvezumutup.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0197/files/microsoft_access_2016_the_complete_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/0928/5024/files/pre_algebra_practice_test_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/0304/4263/files/mijuvezajefot.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/61662318077.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3397/files/nesco_dehydrator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7506/7297/files/1311146315.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7107/files/dapikavaxijenewukegote.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_off00006850.bin
355bf0ab70b3dff5652a5b7a2b6c0b8895a25cb940522187cbf87efaf8c0828a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6850 5740 bytes
font_01_sfnt_off00007bd2.bin
3ff53ee6cfd73ee56cb2f85dee4a574c5c440e7d9d1fbfb267a88a401b0ebd71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD2 10068 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.