Malicious PDF — malware analysis report

Static analysis result for SHA-256 186629607a7ae033…

MALICIOUS

PDF

64.0 KB Created: 2020-08-01 08:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4774905ecf1bea557677b1be515bf60e SHA-1: daa7039ed97818b5721ab129a5178bf042ca5c35 SHA-256: 186629607a7ae033357bfcfd224fc0921aaf1133f519e19f06da924dc1687b38
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to potentially malicious or redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The document body, though heavily obfuscated, contains a URL that appears to be a lure. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=tulsa+tv+guide
    • http://files.hannahmugenyi.com/uploads/1/3/1/1/131164446/gatewezamafitafuba.pdf
    • http://files.makeupbybb.com/uploads/1/3/1/3/131381712/zinomezumajiwet_xamaminiwoxesus_radan_gekero.pdf
    • http://files.eggharboryachtclub.org/uploads/1/3/1/3/131379382/f21c584a56.pdf
    • http://files.agapeeducationalconsultantsandtrainers.org/uploads/1/3/0/8/130814900/fitemalabutubax.pdf
    • http://files.kilimanjarodreamadventures.com/uploads/1/3/2/7/132710491/7449782.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/nepeviwakanunofat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45292738862.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/74782481574.pdf
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/vexef.pdf
    • https://cdn.shopify.com/s/files/1/0431/4490/4855/files/guvonu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/70985988351.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/34330301872.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/rajutisisi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6518/0314/files/bedegogepeki.pdf
    • https://cdn.shopify.com/s/files/1/0434/9650/5496/files/85232492819.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000abe4.bin
cd6af48dd09cbca8f89504bee69f88b5fe4f9eb21a719cff2d907daba6ee7ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABE4 4572 bytes
font_01_sfnt_off0000bb73.bin
ab48a49cde082cf6754496410d827f0f149b47b26f4079296625d379c56d7d43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB73 11756 bytes
font_02_sfnt_off0000e305.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 4324 bytes

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