Malicious PDF — malware analysis report

Static analysis result for SHA-256 49815f63d46c0b61…

MALICIOUS

PDF

53.8 KB Created: 2020-07-28 17:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7f2de236fca417ee858ba470c74c2c9 SHA-1: b2876d90c57873296af2e8883713bf0c00364454 SHA-256: 49815f63d46c0b6123a14b6ddc6b2f67d26f6cdb0fdbe0921c3bd729969e935f
152 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs, including a primary redirector to 'ttraff.ru'. The document body, though heavily obfuscated, suggests a lure related to educational content. The ML classifier strongly indicates maliciousness, and the presence of a redirector link points to a phishing or malware distribution attempt.

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=factoring+polynomials+by+grouping+worksheet+answers
    • http://files.sparkd.shop/uploads/1/3/2/6/132695932/c9de6c592c9b7cf.pdf
    • http://files.kcrkradio.com/uploads/1/3/0/7/130739415/2817781.pdf
    • http://files.josephetaylor3.com/uploads/1/3/0/7/130776043/7234909.pdf
    • http://files.josephetaylor3.com/uploads/1/3/0/7/130776043/7234909
    • https://cdn.shopify.com/s/files/1/0439/1786/9211/files/18572986398.pdf
    • https://cdn.shopify.com/s/files/1/0433/3400/8987/files/93302240056.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30408896218.pdf
    • https://cdn.shopify.com/s/files/1/0430/7789/4293/files/38759769820.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/sonebok.pdf
    • https://cdn.shopify.com/s/files/1/0428/3373/9932/files/17356438179.pdf
    • https://cdn.shopify.com/s/files/1/0428/8780/7129/files/murilanenamebutitisonu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/94871079592.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/babefofewenetazuwepiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/7329317221.pdf
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/vatapawenol.pdf
    • https://cdn.shopify.com/s/files/1/0437/3676/0485/files/rijuraxupaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/dumelaxokuwef.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/36466279951.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/68461888542.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_off00008727.bin
cfdce2be0dd36f8321ecf4dd774804685fccdfb9fc487a6dcb04b5cd54cf099c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8727 5584 bytes
font_01_sfnt_off00009a0b.bin
b8b917f9a4907a1faae8a91c39dffb7f93d4835dfd89f91bb86c287ce3057555		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A0B 14260 bytes

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