Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a554e2cb92a48c9…

MALICIOUS

PDF

44.0 KB Created: 2020-07-22 12:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e222ec5d51c9b76d1a670576cf296b51 SHA-1: c29dbe5d73aa07d9acd4ac8f757c56b8aa3d517c SHA-256: 7a554e2cb92a48c9df00038bd2fabdfa1218dce4836b73f11550c2c1ea39b568
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. This behavior is indicative of a link farm or SEO spam campaign designed to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=physics%2012%20rotational%20equilibrium%20worksheet
    • http://files.mrcrall.com/uploads/1/3/1/4/131438843/6543773.pdf
    • http://files.connallyband.com/uploads/1/3/1/8/131856381/koguwoxixude.pdf
    • http://files.bbeautyco.com/uploads/1/3/1/8/131856703/6527427.pdf
    • https://cdn.shopify.com/s/files/1/0432/9606/3652/files/6277252978.pdf
    • https://cdn.shopify.com/s/files/1/0434/4555/1271/files/xotibipasemi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/75088567853.pdf
    • https://cdn.shopify.com/s/files/1/0432/1912/4382/files/95202308220.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/lujinozuv.pdf
    • https://kufakim.files.wordpress.com/2020/07/nesofogikimomife.pdf
    • https://bivuwid.files.wordpress.com/2020/06/xomak.pdf
    • https://nofosepeji.files.wordpress.com/2020/07/24570151830.pdf
    • https://gamekupori.files.wordpress.com/2020/06/riwomogunatavex.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/zokedufolifujovorafodom.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/somibilidot.pdf
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/51572634260.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rirolor.pdf
    • https://cdn.shopify.com/s/files/1/0431/4615/0039/files/fowidosovitabupomu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5062/3385/files/runudexetego.pdf
    • https://cdn.shopify.com/s/files/1/0431/6243/5739/files/82450513709.pdf
    • https://cdn.shopify.com/s/files/1/0429/5029/5708/files/zusigilizunowonikimibu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9782/6207/files/62886547297.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e38.bin
1de2174be548107750fa9812a69e04c688fd351d31878ee3058f3ad9a44df393		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E38 5628 bytes
font_01_sfnt_off00008144.bin
cdb5c4495a1a4e1cace7f2f1647493b3730fd2c13edd385496ddb0ca705989e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8144 9708 bytes

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