Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf4dac21ed06f53…

MALICIOUS

PDF

50.7 KB Created: 2020-08-05 16:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f59a98f1ccd2848068c97d2e7c30bc81 SHA-1: d26483090554e0b2276230bbca226d68ffc260e8 SHA-256: ddf4dac21ed06f5323a0b043c78a3677d6fc7bc9e10ef1b75e4eb94cf4373779
152 Risk Score

Malware Insights

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

The PDF contains numerous links, identified as a link farm, directing to external resources. One critical heuristic indicates a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

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=difference+between+antigenic+shift+and+antigenic+drift+pdf
    • http://files.ozimekmath.com/uploads/1/3/0/7/130775280/fanimoresawe.pdf
    • http://jisazo.powerproductions.ca/uploads/1/3/2/6/132681352/7119650.pdf
    • http://files.richtechnologygroup.com/uploads/1/3/2/6/132695663/dotuki.pdf
    • http://files.kitsyhooverskincare.com/uploads/1/3/1/4/131453498/tedipavu.pdf
    • http://files.youbestinvest.com/uploads/1/3/1/4/131437627/5e0102000e7ce.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/lilofu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/zasofaruxakujirafe.pdf
    • https://cdn.shopify.com/s/files/1/0437/0857/9993/files/kevibeziresokudenapidilo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9971/6770/files/79355056564.pdf
    • https://cdn.shopify.com/s/files/1/0448/9605/9547/files/ultrastructure_de_la_cellule_animale_et_vegetale.pdf
    • https://cdn.shopify.com/s/files/1/0436/4464/9630/files/todadomezujusivatej.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/66407053057.pdf
    • https://cdn.shopify.com/s/files/1/0433/4705/0661/files/tagoruvobez.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/604565356.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4642/files/nopimekalenusimegozo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7655/8746/files/89979920187.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7454/files/soxura.pdf
    • https://cdn.shopify.com/s/files/1/0439/5961/5646/files/lanufudinulifopiwune.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0861/files/12540980033.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_off000079a1.bin
559e534ec34e9e75d72e90567b437e435e0bb6231a2a6ba63c125004f6b6df48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A1 5296 bytes
font_01_sfnt_off00008bad.bin
ab31a5a4a3bde3281cd3d4af4ef6f762e10bae689adacee67f61df2e7f473dc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAD 10168 bytes
font_02_sfnt_off0000ae77.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE77 4324 bytes

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