Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3720c9004044ee…

MALICIOUS

PDF

53.1 KB Created: 2020-08-16 14:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7635cf718d7fb8802519ad8dc8e00b9 SHA-1: 50a7753ea16140de55ca8b12740555b94fa71998 SHA-256: 8b3720c9004044ee2a982e3a4de01341ccf3389257fdbd9e1c87d6c221f92ac8
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Read marathi books online free' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious nature of this PDF.

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=read+marathi+books+online+free
    • http://files.andovertheatre.org/uploads/1/3/1/0/131070291/97bab2650817b1.pdf
    • http://lelejebe.suzannakrivulskaya.com/uploads/1/3/0/9/130969368/2981896.pdf
    • http://xopopu.bigt-farms.com/uploads/1/3/1/3/131384429/8918648.pdf
    • http://jupanal.belizeanstudies.com/uploads/1/3/0/9/130969502/vifejevukixa.pdf
    • https://cdn.shopify.com/s/files/1/0437/3587/5749/files/accounting_ledger_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/4877/9426/files/costing_system.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevesuladufutaniwor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66456909559.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6119/files/seller_support_associate_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/6972/6110/files/49973290225.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28391359898.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/medarovadujagowurevasote.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/vigesopen.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/70752816491.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/loxawevezobebizosox.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_off000091df.bin
eace2f185b3842cb5de77cddfc6f4e9c49e1ddb2ad0f6188a5bdd6e1300220b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x91DF 5360 bytes
font_01_sfnt_off0000a3f1.bin
30fd1f67945035cb6c57c1342a75b89743929e9933e8a23334be14f562c12b31
pdf-font-stream PDF embedded font (sfnt) at offset 0xA3F1 10384 bytes