Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ca4961bc8217d5…

MALICIOUS

PDF

42.6 KB Created: 2020-07-31 17:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08855258db996f8abd7e8834b862ed50 SHA-1: 33b1ee8e4a91eeb977268f6ce77a6e98e91fa2ba SHA-256: b2ca4961bc8217d554093f04691f15c7d754e6ff748f12d53687ac427f90321b
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a guide for installing PostgreSQL. The document body and embedded URLs indicate a link farm strategy, likely intended to drive traffic to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is a phishing or scam document.

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=install+postgresql+mac+brew
    • http://files.frhstrainingconsultants.com/uploads/1/3/1/3/131379236/wiler.pdf
    • http://files.londonlivefitness.com/uploads/1/3/1/6/131637043/5ea1c31b05b8.pdf
    • http://files.baumanlaser.com/uploads/1/3/1/4/131453302/wesetina_wemejimatoxa.pdf
    • http://files.ahealthypositive.com/uploads/1/3/0/7/130739713/1443402.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/54018683983.pdf
    • https://cdn.shopify.com/s/files/1/0438/8444/5864/files/bosonekegoriruvakogow.pdf
    • https://cdn.shopify.com/s/files/1/0437/6661/2130/files/63915169063.pdf
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/kedinuzatovuvabaxepinuzaw.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/31946983873.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8117/files/19459223836.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/finuzadefowagijavuweno.pdf
    • https://cdn.shopify.com/s/files/1/0434/2064/7576/files/mokezux.pdf
    • https://cdn.shopify.com/s/files/1/0430/3018/4098/files/buxerunokuwotezuxa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/57511260365.pdf
    • https://cdn.shopify.com/s/files/1/0429/3217/5014/files/71638934424.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a4f.bin
2c775112177a9635a4b197624508699e0eccef78d3fa67e76e75520aa78bc0e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4F 5288 bytes
font_01_sfnt_off00006c32.bin
011b0a3b1dc949954651b1ca9799cd9360f0a3a0213fd503a0ecc5b008478527
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C32 10396 bytes
font_02_sfnt_off00008fc1.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC1 4324 bytes