Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2da13fae7942a77…

MALICIOUS

PDF

79.6 KB Created: 2020-08-07 00:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d742838b6281da809811dcd8beff3b68 SHA-1: af67434ad017e62b5006bd47ecc0c7c902b8c05c SHA-256: e2da13fae7942a777a826dc2c2f69b5a4b2e6d14d926bf0d2b7199b4ae14e865
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links redirects to a known malicious redirector, ttraff.cc. The document body, though heavily obfuscated, contains text related to 'present indefinite tense exercises in urdu pdf', suggesting a lure to disguise the malicious links. 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=present+indefinite+tense+exercises+in+urdu+pdf
    • http://files.misscookbook.com/uploads/1/3/1/8/131871701/2365290.pdf
    • http://zoreg.idealdrycleaners.co.uk/uploads/1/3/1/3/131380005/duweka-pigikimivonusi-tovelenu.pdf
    • http://files.halifaxukrainianclub.com/uploads/1/3/0/7/130738794/xifokojigizamapatow.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7448/files/nulebeginenasipofojigud.pdf
    • https://cdn.shopify.com/s/files/1/0431/5388/3293/files/80051549542.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4675/files/kovowumuwox.pdf
    • https://cdn.shopify.com/s/files/1/0434/3755/5864/files/how_to_install_paint._net.pdf
    • https://cdn.shopify.com/s/files/1/0433/9109/0844/files/92228109450.pdf
    • https://cdn.shopify.com/s/files/1/0446/3493/1363/files/astm_a325_specification.pdf
    • https://cdn.shopify.com/s/files/1/0430/9365/5716/files/rosofo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4803/2666/files/86415574953.pdf
    • https://cdn.shopify.com/s/files/1/0429/2670/2758/files/404212414.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/99017626277.pdf
    • https://cdn.shopify.com/s/files/1/0447/6495/4775/files/plantronics_c054_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/4868/0089/files/bautismo_de_fuego_andrzej_sapkowski.pdf
    • https://cdn.shopify.com/s/files/1/0429/4544/6044/files/sifupobol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000f88b.bin
1442c21bfb48e6a49ef285915d06b330cece95b1041cd0fe815b2edf8a7e5bcf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF88B 24328 bytes
font_00_sfnt_off0000c45e.bin
80f66526f875bba6a1237d98fe1df5a8c418748e106055231b5891558fd65c4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC45E 4748 bytes
font_01_sfnt_off0000d48c.bin
9c8f60773961e57670a648d40e00a42fcaa0d9c58381ec9d671e1136d7084b2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 10716 bytes
font_03_sfnt_off00012297.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12297 4324 bytes

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