Malicious PDF — malware analysis report

Static analysis result for SHA-256 8339f0b11c14b1ab…

MALICIOUS

PDF

75.6 KB Created: 2020-08-20 03:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ae85a6f4fe4159232fbca888af85f38 SHA-1: 93175441284499c186e555c8038215d94374b92e SHA-256: 8339f0b11c14b1abbb6d45b5df0085222bceb9bb24fcf64e1e54236d0af3072f
152 Risk Score

Malware Insights

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

The PDF contains a direct link to a known malicious redirector, ttraff.com, which is further obfuscated by a keyword related to a song title. The ML classifier strongly indicates maliciousness. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to obscure the ultimate destination or to spread malicious content. The document body itself is heavily obfuscated but contains the malicious URL.

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=dream+of+californication+song
    • http://files.mosholudaycamp.com/uploads/1/3/0/9/130969312/bcfaed50065.pdf
    • http://dusovugo.bystyleitnow.com/uploads/1/3/0/8/130874050/9529748.pdf
    • http://fivaf.miniaturecupcakes.com/uploads/1/3/0/7/130738970/fufebuvokov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemisavixazesunomezixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6386/files/55102584262.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/antonino_cannavacciuolo_libri.pdf
    • https://cdn.shopify.com/s/files/1/0437/1379/0106/files/96099760808.pdf
    • https://cdn.shopify.com/s/files/1/0444/3789/7383/files/bruchrechnen_aufgaben_6._klasse.pdf
    • https://cdn.shopify.com/s/files/1/0451/3621/6229/files/wii_point_generator_no_survey.pdf
    • https://cdn.shopify.com/s/files/1/0434/1488/0405/files/79348493585.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/3574668504.pdf
    • https://cdn.shopify.com/s/files/1/0430/1219/4463/files/obtain_accident_report_ny.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/30027059516.pdf
    • https://cdn.shopify.com/s/files/1/0429/8748/7395/files/99880317059.pdf
    • https://cdn.shopify.com/s/files/1/0438/6829/1232/files/understanding_business_11th_edition_ebook.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_off0000de68.bin
3a875c0223368313a1f0cd2d5029ff7d0239cb4bebe45b523fdb3fdcc0643dda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 3136 bytes
font_01_sfnt_off0000e99e.bin
06e51a418265e77bd78eb6b148d1352667db2d4ae12bb5cb829a8179b59f47d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 5200 bytes
font_02_sfnt_off0000fb3b.bin
a031f75bf61a45047e7a501c59c9a7abbf8970082d057d986874d90b4c899c46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 10476 bytes

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