Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6c159052f6d342…

MALICIOUS

PDF

53.4 KB Created: 2020-08-26 13:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e11e2b440ddf76d36fed384e78759df6 SHA-1: 42be7907fe423eab95940bd2d2d5d63771c9b3f2 SHA-256: bd6c159052f6d342c299a7b58c02eeabb1db66927f0b006d45921a6e45fb38c2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.001 Malicious Link

The PDF contains a malicious redirector link that points to `https://ttraff.com/pify?keyword=cambridge+ielts+6+listening+test+4+answers`. This URL is flagged as malicious and is part of a link farm designed to lure users with seemingly relevant content. The document body, though heavily obfuscated, contains references to IELTS listening tests, reinforcing the lure. The ML classifier strongly indicates maliciousness.

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=cambridge+ielts+6+listening+test+4+answers
    • http://files.westwoodelementarypta.com/uploads/1/3/2/6/132696146/voxabiv-jadiziw.pdf
    • http://motelo.anavantage.com/uploads/1/3/0/8/130874565/4645fa6.pdf
    • http://files.onceuponadreamllc.com/uploads/1/3/1/4/131438176/3501dff3e0d5.pdf
    • https://cdn.shopify.com/s/files/1/0430/5515/3303/files/wopajifeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/20918272688.pdf
    • https://cdn.shopify.com/s/files/1/0429/3731/9590/files/64014689865.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/applied_econometrics_with_r.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/39319962869.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/nagonobojepadiwob.pdf
    • https://cdn.shopify.com/s/files/1/0432/9593/2574/files/air_pollution_causes_and_remedies.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6307/files/35590910141.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/10759953665.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/66089594102.pdf
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/favefiniwo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0042/2819/files/list_of_short_vowel_words.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_off00009139.bin
ddd440adea0254744e9032c5658ef212d31d92347a3382a1a6de0b8f9a8e842d
pdf-font-stream PDF embedded font (sfnt) at offset 0x9139 5524 bytes
font_01_sfnt_off0000a401.bin
680dfd41f2d4e1408b2202d58ed557ebd3f3c5474080d344a4630481f63fd2aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xA401 10704 bytes