Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac56681cd910be8b…

MALICIOUS

PDF

48.3 KB Created: 2020-11-05 02:07:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a17ff624d391b604d174ae2f4ec9ed3 SHA-1: 96deb31edfd46f7b2ba4884d563c5402e70d84ae SHA-256: ac56681cd910be8beb6c732f6b2eda9c132f3edb78a1a314547928ca8da2d8c0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, 'https://ggtraff.ru/strik?keyword=hardin+county+high+school+address', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into clicking it. The presence of numerous other PDF links, some pointing to benign-looking S3 buckets, indicates a potential link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the heuristic firings strongly suggest malicious redirection.

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://ggtraff.ru/strik?keyword=hardin+county+high+school+address
    • https://rogakaroguw.weebly.com/uploads/1/3/4/5/134517982/moluwatan-newufivepe-dotas-rufena.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kotenu/sozakovikewid.pdf
    • https://uploads.strikinglycdn.com/files/9c3f05fe-5844-477e-8728-63a58e95d794/viluzetezopumoselilimo.pdf
    • https://uploads.strikinglycdn.com/files/fd4b4568-dd22-42d2-98c2-e026c399c945/nakugenotevubadadumomasal.pdf
    • https://uploads.strikinglycdn.com/files/274e4215-0177-4c71-91f1-179e927da24a/4187950561.pdf
    • https://uploads.strikinglycdn.com/files/4224ad5b-5d41-430e-8a91-d991782dde90/race_sorting_people_pbs.pdf
    • https://uploads.strikinglycdn.com/files/0ad94386-393e-4477-8d3f-95df6ecd3691/37388780448.pdf
    • https://s3.amazonaws.com/felasorarabipis/tifamenasukun.pdf
    • https://s3.amazonaws.com/dazemi/chibi_base_group_of_5.pdf
    • https://uploads.strikinglycdn.com/files/ca53a37a-7363-4635-bd9e-9722c90459b9/gezatefulugudoz.pdf
    • https://s3.amazonaws.com/resixexi/identification_of_medicinal_and_aromatic_plants.pdf
    • https://uploads.strikinglycdn.com/files/faf1f50a-c51e-436c-82b9-4e188c6d416b/53233431628.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054d8.bin
3b0390c19bd0b8c65b21639ed74b9fdff29a57b1a25a985b9d11a06701c90a3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54D8 5148 bytes
font_01_sfnt_off00006643.bin
488ffee5e9c33bcc1f3f00aec749f35977d0cdd209ffadaee35194d66ecc177d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6643 6148 bytes
font_02_sfnt_off00007623.bin
e731e0dc7fa194a76533fe2a63b84b30e7c0de1a7268ffd633d6905e7bbc9c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7623 14356 bytes
font_03_sfnt_off0000a449.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA449 4324 bytes

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