Malicious PDF — malware analysis report

Static analysis result for SHA-256 814d17709388333c…

MALICIOUS

PDF

60.5 KB Created: 2020-08-07 07:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34315ac271cc47e046368b4f58af3e7d SHA-1: 80aaf5df68b0cd808479931b058b496b2e564fb4 SHA-256: 814d17709388333c82c75bf67ccf50769999f0b5123d085c6c6724ef6c2cca28
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. This behaviour is indicative of a link farm designed to distribute malicious content or phish for information. The ML classifier also strongly indicated maliciousness.

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=adulterants+in+sugar+pdf
    • http://files.nicholebertucci.com/uploads/1/3/0/7/130740141/8397452.pdf
    • http://files.salmochildrenscentre.net/uploads/1/3/0/8/130813548/gamelumife.pdf
    • http://files.anchoryourfootprint.com/uploads/1/3/1/6/131606011/591c8.pdf
    • http://bosava.brunchprojectproductions.com/uploads/1/3/2/8/132814930/zokivodekutijow.pdf
    • http://files.capturedbyecp.com/uploads/1/3/1/8/131856516/6bbcb04ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/6213/0848/files/18825778937.pdf
    • https://cdn.shopify.com/s/files/1/0429/3787/6639/files/android_developer_tools_essentials_android_studio_to_zipalign.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3483/files/sutixatisefuge.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/42197094149.pdf
    • https://cdn.shopify.com/s/files/1/0434/8946/0376/files/dozinewikaxudelejupi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2050/7544/files/ap_grama_sachivalayam_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/31368409043.pdf
    • https://cdn.shopify.com/s/files/1/0430/2720/2205/files/rifafevamerudukoduvozom.pdf
    • https://cdn.shopify.com/s/files/1/0454/1775/8888/files/concurrent_programming_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0432/9648/9632/files/36944243195.pdf
    • https://cdn.shopify.com/s/files/1/0438/9247/4011/files/bosawanazifopelanoke.pdf
    • https://cdn.shopify.com/s/files/1/0431/9241/8468/files/fuzemixuga.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aeef.bin
655f97147d19d261707559887ed680f3ec06d278f605fac792b891202578d947		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEF 5200 bytes
font_01_sfnt_off0000c0ae.bin
b2729b55390aa7d3154b5ede467536b8ab756a130a8dbc1e1b3aec0537c1dce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AE 10552 bytes

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