Malicious PDF — malware analysis report

Static analysis result for SHA-256 b285f97f222acb44…

MALICIOUS

PDF

45.1 KB Created: 2020-08-04 13:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6e884ff5f00f6011ad06b8edd480e21 SHA-1: 9b015aa601c3852ddb657bc10c263a003280f2e0 SHA-256: b285f97f222acb4417f6217f8dbcd93733d06dd4dc4ed992fce401d0d82423e1
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to a link farm hosted on Shopify. One of these URLs, 'https://ttraff.ru/pify?keyword=alif+lam+mim+para+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or contains minimal readable content, but the presence of the link farm and the malicious redirector strongly suggests an attempt to lure users to malicious 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=alif+lam+mim+para+pdf
    • http://files.dragonflysenaru.com/uploads/1/3/0/7/130776487/kalurorupox-woxipawizixin-nuxifamogobar-vasena.pdf
    • http://files.evalew.com/uploads/1/3/1/8/131856039/2393684.pdf
    • http://files.choosejoyanyway.org/uploads/1/3/1/4/131407102/70761.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/dewabiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3744/files/72692108063.pdf
    • https://cdn.shopify.com/s/files/1/0438/9021/3019/files/300218742.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/40242926331.pdf
    • https://cdn.shopify.com/s/files/1/0440/6575/1192/files/liselom.pdf
    • https://cdn.shopify.com/s/files/1/0430/6426/2818/files/vobonepupowunozuvunep.pdf
    • https://cdn.shopify.com/s/files/1/0436/0231/3373/files/kilolumiduzapad.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5396/files/jasobuxo.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/basic_classroom_language.pdf
    • https://cdn.shopify.com/s/files/1/0435/4280/6679/files/77166816004.pdf
    • https://cdn.shopify.com/s/files/1/0428/1863/3894/files/walexexorig.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/member_fdic_logo.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_off000062d2.bin
bc02cd2accaf64600742c5c1cdc93efdf6f97772ad19081cadf21f8c06831334		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D2 4996 bytes
font_01_sfnt_off000073be.bin
59099f93564be2b420ab7a6bc4503fbf1ca191e4f40f77fba4d1663fff8c33f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73BE 10200 bytes
font_02_sfnt_off000096a5.bin
390998478d5e0b50f845c80d1fac63f0437596f3f13f1c435891b5e755357000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96A5 4632 bytes

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