Malicious PDF — malware analysis report

Static analysis result for SHA-256 4626de839a6ac09c…

MALICIOUS

PDF

45.8 KB Created: 2020-08-08 18:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cd2ee9432ae9b543140334ff169c040 SHA-1: f2fa50fa15aa74de6b01795e52c7116215a0f6db SHA-256: 4626de839a6ac09cb58d6bf2cd1b79421de71aaffd79a46353b309216e2aa769
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a redirector service known to host malicious content. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or obfuscated, but the presence of the malicious redirector URL is the primary indicator of malicious intent. The file is likely part of a link farm or SEO poisoning campaign to distribute malware.

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=potentilla+anserina+pdf
    • http://files.sbelart.com/uploads/1/3/2/8/132814505/jowalinil_tomumegulefaf_metamosegagok.pdf
    • http://dawifoj.mayfieldvocalmusic.org/uploads/1/3/1/8/131871390/sekogizifuregufugak.pdf
    • http://files.jragourdart.com/uploads/1/3/1/4/131406749/3114f1dc136d.pdf
    • http://files.foodintolerance.net/uploads/1/3/2/7/132710780/wamel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5578033559.pdf
    • https://cdn.shopify.com/s/files/1/0431/8366/9412/files/sovozogenuxadunik.pdf
    • https://cdn.shopify.com/s/files/1/0434/9778/3458/files/58226448510.pdf
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/57476284396.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/dapizopopasopatimetefukub.pdf
    • https://cdn.shopify.com/s/files/1/0427/6781/0726/files/92500724701.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2930/files/fourier_analysis_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3760/files/15847125258.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/70314499475.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/87436751964.pdf
    • https://cdn.shopify.com/s/files/1/0432/3940/7784/files/47494482839.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_off000066bd.bin
b6ff387d1b853587460ae654564f4cba9c8eee5fb9e5477582e3bdfc5590a28f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66BD 4824 bytes
font_01_sfnt_off00007723.bin
cd5e2dd389a5e6f1671908efdbc82bfbcf3707fdabc8a4ce046245f44a88057a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7723 10356 bytes
font_02_sfnt_off00009a4f.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4F 4324 bytes

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