Malicious PDF — malware analysis report

Static analysis result for SHA-256 1767ecfb33b2d0b5…

MALICIOUS

PDF

34.4 KB Created: 2020-08-16 11:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09cfbe762c03e6ddd89b775a435d2b51 SHA-1: fac71e3b12ca5b772d6b9d3926a790a0e51b73fa SHA-256: 1767ecfb33b2d0b556ad3cb7f10db17ccdfd97c8571c1fbfb05ee3a12bd1b7fb
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=zap+mama+iko+iko'. It also exhibits a PDF link farm heuristic, containing numerous external PDF links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content.

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=zap+mama+iko+iko
    • http://files.camdenedupartnership.com/uploads/1/3/1/6/131606492/zivugumadadaz-rugefoge-tegepila.pdf
    • http://zewine.bhsumath.com/uploads/1/3/1/3/131398591/kerirowojuwe.pdf
    • http://files.cyrphotography.com/uploads/1/3/0/9/130969158/3951034.pdf
    • http://pogonufoz.chamber-choir.com/uploads/1/3/1/6/131637136/bajavanumalotof_kudugazog_revuxetat.pdf
    • http://pilip.nmussoarchitects.com/uploads/1/3/0/8/130813528/f35865616a04346.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7963/1012/files/41320136438.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5876/files/53515710733.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/paytm_barcode_image.pdf
    • https://cdn.shopify.com/s/files/1/0438/5318/5174/files/51008470445.pdf
    • https://cdn.shopify.com/s/files/1/0444/2708/3943/files/alphabet_writing_practice_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/0533/0083/files/37776614276.pdf
    • https://cdn.shopify.com/s/files/1/0447/1370/5625/files/christian_baby_boy_names_with_meaning_gift_of_god.pdf
    • https://cdn.shopify.com/s/files/1/0434/0868/7269/files/xuwesibefuwopula.pdf
    • https://cdn.shopify.com/s/files/1/0429/7739/4847/files/41423737633.pdf
    • https://cdn.shopify.com/s/files/1/0435/3998/8648/files/xelopejine.pdf
    • https://cdn.shopify.com/s/files/1/0436/1335/6189/files/wudot.pdf
    • https://cdn.shopify.com/s/files/1/0439/0184/5659/files/jumbling_reasoning_questions.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/divegemodunob.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b6d.bin
966f68c217268da0a81bdd814f7f3e88a7cb8c68e960f026240e69bb5544db86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B6D 4680 bytes
font_01_sfnt_off00005b4b.bin
85134fc797417bda8104aa301d891df891e092012a3b1d806feee07f9774ae0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B4B 9816 bytes

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