Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd68830184ded27d…

MALICIOUS

PDF

40.2 KB Created: 2020-08-19 06:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9c146532fe1a6823952f626d8cc443f SHA-1: df51630bc2b2079ba40a849661a1e021b6fdecd2 SHA-256: dd68830184ded27dd6f29378b32ec75f4e4e716718aaa319ec0050e70713a381
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to external resources, a technique often used for SEO poisoning or to host phishing content. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=accg100+unit+guide+2019`. The ML classifier also strongly indicated maliciousness. The document body itself is largely unreadable binary data, but the presence of the malicious redirector link is the primary indicator of malicious intent.

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.cc/pify?keyword=accg100+unit+guide+2019
    • http://files.amberwhitted.com/uploads/1/3/0/9/130969075/67d9e7.pdf
    • http://vuzon.emmamcnairy.com/uploads/1/3/1/3/131381428/53cb5043018.pdf
    • http://files.artistmarnie.com/uploads/1/3/1/4/131406258/laxuxopol-bajewefevarid.pdf
    • http://files.hollywood-resumes.com/uploads/1/3/1/4/131453818/2afa15d7e2.pdf
    • http://fadaru.en.agiteysirva.com/uploads/1/3/1/3/131382406/dobewiru_ronil_kodotovisu_besalade.pdf
    • https://cdn.shopify.com/s/files/1/0435/3818/6394/files/alcoro_comentado.pdf
    • https://cdn.shopify.com/s/files/1/0434/7445/2632/files/tidozajirusebev.pdf
    • https://cdn.shopify.com/s/files/1/0431/7406/8390/files/35208778044.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/piziduvuzibetonalumurok.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92702877098.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5453/files/26046183969.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luzugojozawok.pdf
    • https://cdn.shopify.com/s/files/1/0429/1877/2903/files/67838170869.pdf
    • https://cdn.shopify.com/s/files/1/0433/4993/4229/files/67532435245.pdf
    • https://cdn.shopify.com/s/files/1/0427/7442/9852/files/43135247361.pdf
    • https://cdn.shopify.com/s/files/1/0436/3111/6448/files/mixed_up_sentences_worksheets_3rd_grade.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_off0000610d.bin
8222016bbafc000ffd9fc468c4c1c0d1b924d7701e72531d3274a0618da8ea1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x610D 5060 bytes
font_01_sfnt_off00007264.bin
aa7ca1ce1b7e6c97f7088143becb1fedc785cc917c9e5169ac47d758aba94ba2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7264 9892 bytes

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