Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67216c96f92ee90…

MALICIOUS

PDF

55.0 KB Created: 2020-08-24 05:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef71a8f4094d3917a7627809f355d29b SHA-1: 5f00ebe50595cf473fa5b4b1d23d5ceb4472e9f3 SHA-256: f67216c96f92ee90a7f45dcc60a39a31b3fc20ff84d7407440647155651d4f07
152 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.cc, which is disguised as a link to handwriting practice sheets. The PDF also features a link farm with numerous external PDF links, many hosted on cdn.shopify.com, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious.

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=left+handed+cursive+handwriting+practice+sheets+pdf
    • http://gobulo.ywcahealthandfitness.org/uploads/1/3/2/6/132681481/d3d4075199.pdf
    • http://files.kitchengardenschooluk.com/uploads/1/3/1/4/131453248/lulinirorubikanumo.pdf
    • http://files.tailoredrides.org/uploads/1/3/1/4/131438844/1720289.pdf
    • http://files.ksonstruck.com/uploads/1/3/0/7/130739470/pizuxakekulekam.pdf
    • https://cdn.shopify.com/s/files/1/0465/3252/6238/files/top_hardest_riddles_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/4031/7335/files/nivapilufatudipururam.pdf
    • https://cdn.shopify.com/s/files/1/0433/3718/7493/files/65919741722.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/english_communication_lessons.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/20075845088.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/1891430975.pdf
    • https://cdn.shopify.com/s/files/1/0440/0100/1630/files/insect_science_author_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/aashto_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/11693511052.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/livro_elementos_basicos_de_caldeiraria.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/xikofupuxezomevazeru.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8274/files/subject_verb_agreement_exercises_grade_6.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_off00008996.bin
f3ed142ee7eced548e72b9cf290c6998db77e85d6bfd1017c986b5c09db29423		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8996 5248 bytes
font_01_sfnt_off00009b7b.bin
49be4d7e9362cef6d70f810baf5a6fb7d3ea61d44cf69c8e68e584135eb147d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B7B 10652 bytes
font_02_sfnt_off0000bfee.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEE 4324 bytes

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