Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58cb6387ca74f51…

MALICIOUS

PDF

46.9 KB Created: 2020-08-08 12:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7937389e0f2c0b8bac8f8477ed93463 SHA-1: b1c3adb3de8e613c4bdbb25b395196c7a416b19c SHA-256: f58cb6387ca74f51a09f0ce57742c47b98f7efc3832675a422f1b33684d93e25
150 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, disguised as IELTS writing exam samples. This indicates a phishing or scam attempt. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various documents, likely to improve search engine ranking and distribute malicious content. No scripts were extracted, but the presence of the malicious redirector and the link farm structure strongly suggests a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=ielts+writing+exam+samples+pdf
    • http://files.rcyahoos.com/uploads/1/3/0/7/130775018/8834575.pdf
    • http://files.mischiefprojections.com/uploads/1/3/1/8/131857565/lalil.pdf
    • http://files.joanflemingpoet.com/uploads/1/3/1/4/131453253/9972586.pdf
    • https://cdn.shopify.com/s/files/1/0440/6896/2469/files/tukirozikusufibutuxibokos.pdf
    • https://cdn.shopify.com/s/files/1/0430/6635/9962/files/54959176463.pdf
    • https://cdn.shopify.com/s/files/1/0431/6486/0580/files/escape_from_tarkov_beginner_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/ffxiv_goldsmith_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/40860339797.pdf
    • https://cdn.shopify.com/s/files/1/0433/2018/0894/files/fefitajolubibukulema.pdf
    • https://cdn.shopify.com/s/files/1/0430/9050/9973/files/cambridge_igcse_physics_coursebook_david_sang_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/falexof.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/17303143295.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1285/files/sazejo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/bigupig.pdf
    • https://cdn.shopify.com/s/files/1/0434/1956/6231/files/46199785559.pdf
    • https://cdn.shopify.com/s/files/1/0440/9730/6776/files/xobepakibe.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0529/files/pokemon_strategy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/9212/4572/files/gixijuzakagaxizozevimi.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_off00006c6c.bin
91f6d58456be572d67181b87c6ec85794adae5e39829dbc4fdcf39a25748593e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6C 5136 bytes
font_01_sfnt_off00007dd3.bin
334417e1ff18d14a8600e20f8029bbee54c65299691fc449a928af9225a33bee
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD3 10108 bytes
font_02_sfnt_off0000a054.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xA054 4324 bytes