Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78f83a6a40304ad…

MALICIOUS

PDF

46.9 KB Created: 2020-08-25 00:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b54784b9e281947b43be1b85280775a SHA-1: db5cb51afd6319b755bdc736127a64f4bcb2f6e8 SHA-256: a78f83a6a40304adf8dd68c30a0cd147ce5ac319bb350671cf8dedaa3b346226
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. This link is presented alongside numerous other PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to attract victims. The ML classifier also strongly indicated maliciousness. The primary malicious URL is https://ttraff.cc/pify?keyword=ap+reorganisation+act+2014+in+english+pdf, which likely serves as a lure to a phishing or malware distribution site.

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=ap+reorganisation+act+2014+in+english+pdf
    • http://files.segsprescue.org/uploads/1/3/2/7/132740270/7093326.pdf
    • http://rumoz.griffinukuleles.com/uploads/1/3/2/8/132815028/3934902.pdf
    • http://files.patrickhowe.com/uploads/1/3/1/3/131398385/2182369.pdf
    • http://files.lemonteilrevolution.com/uploads/1/3/2/7/132710765/mimedevuwozakip.pdf
    • http://files.steamboatmountainmagic.com/uploads/1/3/0/9/130969798/nosetixuwosegu-rosazewije.pdf
    • https://cdn.shopify.com/s/files/1/0433/9489/1943/files/accounting_principles_10th_edition_solutions_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/0629/5201/files/wokojikok.pdf
    • https://cdn.shopify.com/s/files/1/0437/7142/9016/files/69171851618.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9758/files/xusaxomopavomojunufimirev.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/antibiotic_sensitivity_test_principle_and_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5126/files/mizapezavazifelifufo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11383010616.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/vubebofuwa.pdf
    • https://cdn.shopify.com/s/files/1/0437/3954/5761/files/wulegabipusejodux.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_off00007894.bin
4060079f419d09e71893d4d1b8e142f215ff21062627daf57ab25ba645e01b82
pdf-font-stream PDF embedded font (sfnt) at offset 0x7894 5820 bytes
font_01_sfnt_off00008c64.bin
cebf1c55cd2d45ce62f4794226890710f32fea56dca617d5659e8fec27b73a2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C64 9920 bytes