Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b93a89f8621d695…

MALICIOUS

PDF

49.6 KB Created: 2020-08-28 08:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76cdca46e10a186bcbebb0528da57266 SHA-1: 629fa1e20105d35831fcb8c9aabc189d16ffdfcb SHA-256: 7b93a89f8621d695a37fcec9efe78a646a01323d90546165d1eaf1b5301dd37b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external PDF links, one of which is a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to click on a link that ultimately leads to malicious infrastructure, likely for further exploitation or malware delivery.

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.link/pify?keyword=graphic+design+rules+pdf
    • http://files.bringomusic.com/uploads/1/3/2/6/132696015/4608654.pdf
    • http://ledomojun.powersourcedubai.com/uploads/1/3/0/8/130813714/lifelonug-palobatumonarad-narerogat.pdf
    • http://libut.caraday.me/uploads/1/3/1/4/131438405/nepijajezisazibusok.pdf
    • http://files.eberhartmgmt.com/uploads/1/3/1/3/131378950/bufemowixuzek_jumafun_fimebi_zixaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/4773/9811/files/wolalaku.pdf
    • https://cdn.shopify.com/s/files/1/0429/3722/1276/files/jolurulibitumel.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/30336193338.pdf
    • https://cdn.shopify.com/s/files/1/0435/5116/2523/files/80909203167.pdf
    • https://cdn.shopify.com/s/files/1/0431/4991/8374/files/11292082587.pdf
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/94083941842.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/14730414280.pdf
    • https://cdn.shopify.com/s/files/1/0439/9579/1518/files/91689829989.pdf
    • https://cdn.shopify.com/s/files/1/0429/9109/1875/files/lafixoneludizob.pdf
    • https://cdn.shopify.com/s/files/1/0462/2607/9895/files/crime_patrol_video.pdf
    • https://cdn.shopify.com/s/files/1/0430/6970/2305/files/sasefepufimapasejusoze.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075b6.bin
b88eb330b62782a9f24f698ec80219c7d122a1aba7f7e5abc720de305c9678cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B6 5140 bytes
font_01_sfnt_off00008720.bin
99c8b586018a9f428bc20b7dfe340a69921f0fea1f8ba50845950f0bb5d67510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8720 10580 bytes
font_02_sfnt_off0000ab3b.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB3B 4324 bytes

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