Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ce2fa32d2d8f62…

MALICIOUS

PDF

43.8 KB Created: 2020-08-07 13:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 193cc7ef9efa29b1803198b0d8f584e1 SHA-1: 52cfa1d3071854ded962ebcf5418bf56ec5a7066 SHA-256: e7ce2fa32d2d8f621ef0c089e3740a860fd61dcb0a05335961f28de276facaaf
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to Shopify domains, suggesting an attempt at SEO manipulation or link farming. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=types+of+assimilation+in+english+pdf'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, also contains URLs, reinforcing the malicious redirection pattern.

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.ru/pify?keyword=types+of+assimilation+in+english+pdf
    • http://xuxupag.nicholasclausen.com/uploads/1/3/1/4/131453329/c638b8d1a61.pdf
    • http://files.lhasaapso.is/uploads/1/3/1/4/131482884/zikisunagew.pdf
    • http://files.dbyj.com/uploads/1/3/1/3/131383580/memomaxo.pdf
    • http://files.eridecanada.ca/uploads/1/3/0/8/130813827/c7c8d6.pdf
    • http://files.estevezdesigns.com/uploads/1/3/1/3/131381006/e39afb2b0.pdf
    • https://cdn.shopify.com/s/files/1/0429/4243/1395/files/miwoxuseripegam.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/.pdf
    • https://cdn.shopify.com/s/files/1/0447/8212/5205/files/shinto_rituals.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57379697448.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.pdf
    • https://cdn.shopify.com/s/files/1/0437/1664/0923/files/tomekifoninujotenunom.pdf
    • https://cdn.shopify.com/s/files/1/0434/7507/5225/files/6th_grade_math_review_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/minecraft_gamerule_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/8847/8359/files/subatebilimikakolabubufex.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1121/files/manual_d_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70277109097.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/darkest_hour_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0434/3486/8897/files/bixarupeme.pdf
    • https://cdn.shopify.com/s/files/1/0435/8701/0715/files/38691262725.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_off000067db.bin
38785dff967a3f2eb2ce52eb875aa1df3201fb94446bad52c277f6516ed4ab95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DB 5412 bytes
font_01_sfnt_off00007a28.bin
e96ecfc6092a65516adafbe5432d0857b6e6c1f88943b33fa05b86faba2e9bd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A28 12012 bytes

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