Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f53e25a6b3bb12…

MALICIOUS

PDF

49.3 KB Created: 2020-08-10 15:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e537d7e98369683abc2bbd806cc357b5 SHA-1: 32d48d5c2de9a34abbaf45c3f1c1bb2a41cb29d7 SHA-256: c7f53e25a6b3bb12f770e70ff9434e7279a5222dfe45e5231826d244ce8de112
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body text and embedded links suggest a lure related to diet recipes, which is a common tactic for phishing or scamming. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a further stage of the attack. 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=flat+belly+diet+recipes+pdf
    • http://files.merakiwool.com/uploads/1/3/0/7/130738799/zogusuvero_fuxuwimabalo_mijogitiw.pdf
    • http://files.bonellipark.org/uploads/1/3/1/6/131637308/5723453.pdf
    • http://punozexi.windwolf.com/uploads/1/3/2/8/132814930/7358166a7d.pdf
    • https://cdn.shopify.com/s/files/1/0434/8038/3653/files/tepujakirefajakotuvuzum.pdf
    • https://cdn.shopify.com/s/files/1/0438/5089/1424/files/69724575171.pdf
    • https://cdn.shopify.com/s/files/1/0431/0990/8637/files/56707041612.pdf
    • https://cdn.shopify.com/s/files/1/0433/0265/0014/files/calculus_graphical_numerical_algebraic_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/4694/5436/files/2035587349.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/jarawanubunubekoxurivodo.pdf
    • https://cdn.shopify.com/s/files/1/0439/2170/3067/files/24565641444.pdf
    • https://cdn.shopify.com/s/files/1/0430/5495/6695/files/42751842497.pdf
    • https://cdn.shopify.com/s/files/1/0432/6624/4764/files/raffi_the_more_we_get_together.pdf
    • https://cdn.shopify.com/s/files/1/0432/5674/2046/files/dozili.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/moseba.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/befazumituwoza.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_off00007641.bin
4a46d879e8dbe77004d6ccd62b7b33290c91c50bcc421accd339cc25d98eb419		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7641 4920 bytes
font_01_sfnt_off0000870a.bin
fe2666036050144e87c24ac107d245c0cf0d6cfcd986a0032e25ca8780241a11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x870A 10288 bytes
font_02_sfnt_off0000a9e2.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9E2 4324 bytes

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