Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b83b720e25535f…

MALICIOUS

PDF

48.6 KB Created: 2020-08-04 04:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5f27b3fc0e370a5c2fc4d556de23f09 SHA-1: e00848bffcf4d2a71bbff8fb22baf45c0bbc2e1c SHA-256: b3b83b720e25535fd2facbb8a7dfeb7f50c8714cab825b55dafb23fa01c26ce7
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be a lure for users to click on a link, ostensibly for a free PDF, which then redirects to malicious infrastructure.

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.com/pify?keyword=john+berger+ways+of+seeing+free+pdf
    • http://files.bluffsplus.com/uploads/1/3/2/8/132815015/lifitopuxunilab-funezij-xojifibexozur-togugadulumewox.pdf
    • http://files.viewpulsar.com/uploads/1/3/2/6/132695568/feravozixex.pdf
    • http://files.sstvipgroup.com/uploads/1/3/2/6/132681308/kinet_vumuguwonomagob.pdf
    • http://files.marilynkelley.net/uploads/1/3/1/3/131383467/safarili.pdf
    • http://files.bossbattlegamesarcade.com/uploads/1/3/1/3/131397946/ef6699.pdf
    • https://cdn.shopify.com/s/files/1/0436/2531/6514/files/xirosodabazu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/sibazaxuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/xudakalepivovozere.pdf
    • https://cdn.shopify.com/s/files/1/0433/8951/7978/files/4185672550.pdf
    • https://cdn.shopify.com/s/files/1/0430/9955/3959/files/18302924156.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/javirigutoxunotunexejiwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/72376703515.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7637/files/john_deere_tractor_repair_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0427/9386/1279/files/reddit_meth_stories.pdf
    • https://cdn.shopify.com/s/files/1/0428/9013/3663/files/icy_veins_arms_warrior.pdf
    • https://cdn.shopify.com/s/files/1/0432/7083/2291/files/12350064105.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/zanemipawifomava.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6976/files/81962464900.pdf
    • https://cdn.shopify.com/s/files/1/0431/5706/1788/files/25144614954.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_off000071f5.bin
ddac97e3f279079d96f5ff68190d7dbe4c6983d6197cb454e0dd7d9770ee3904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F5 5304 bytes
font_01_sfnt_off000083f8.bin
d48b0c5e0fd058c0976629ead2dac28c93401ff3ceeacecdb2f5db61d85b0a80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83F8 10332 bytes
font_02_sfnt_off0000a6b9.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6B9 4324 bytes

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