Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ebacf561b1b8a1…

MALICIOUS

PDF

41.3 KB Created: 2020-08-03 13:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3905d6bf584f66c641a75f3e8de61b40 SHA-1: 289ff94633dff00fe66d414aaaa61dc24a3112e4 SHA-256: b1ebacf561b1b8a114e72e94522615fe8b3501a27c1319e3289d91406ddc648f
152 Risk Score

Malware Insights

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

The PDF document contains a significant number of embedded links, with one identified as a malicious redirector. The document's content appears to be a worksheet, likely a lure to encourage users to click on the malicious links. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malicious content through numerous seemingly benign links. No scripts were extracted, and the primary threat appears to be the redirection 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.cc/wb?keyword=preterite%20and%20imperfect%20practice%20fill%20in%20the%20blank%20worksheet
    • http://files.solfeggiohypnosis.com/uploads/1/3/1/4/131483149/8924504.pdf
    • http://files.marblebarbakery.com/uploads/1/3/1/4/131453636/3856575.pdf
    • http://files.alaskaseakayaking.org/uploads/1/3/2/7/132740536/supidolexep.pdf
    • http://files.boilingfrogproductions.com/uploads/1/3/0/8/130813732/zesanivegokemut-givod-bobuwovabifa.pdf
    • http://kowifo.beachfronthl.com/uploads/1/3/1/0/131070718/73025a7d5.pdf
    • https://cdn.shopify.com/s/files/1/0434/4007/9005/files/37680526969.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/hand_to_hand_combat_training.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/todd_lammle_ccna_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/9740/7126/files/45976784363.pdf
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/21019307936.pdf
    • https://cdn.shopify.com/s/files/1/0435/8724/0095/files/vubofepifidofo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/zulagozuvatedatenifuzazuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/lalupugokagekutepazinop.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/3865245864.pdf
    • https://cdn.shopify.com/s/files/1/0436/6788/2134/files/factorio_island_seed.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xoperesotojazi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4229/0336/files/reniwoxexatiwipot.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/24956212904.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/
    • https://cdn.shopify.com/s/files/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000557e.bin
3a243d059287b211b0867ee4a76a0f85d4cf8df6f7e6f7a573438c1276ef74e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x557E 5480 bytes
font_01_sfnt_off000067ef.bin
9df5e9bf76aee4a111c9d29a9d1213a7988698acaaf829033509973c1eea0e60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67EF 9912 bytes
font_02_sfnt_off000089b6.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89B6 4324 bytes

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