Malicious PDF — malware analysis report

Static analysis result for SHA-256 76361b980fb8342f…

MALICIOUS

PDF

55.6 KB Created: 2020-08-15 02:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d46661ef1445eb5d1e791f34b3063596 SHA-1: 9463a8ea4dc80f3b427e87052ee726363ed931f4 SHA-256: 76361b980fb8342fb07b306c122b9a0f752e7d74c7f332966b7ad703898eda68
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to manipulate search engine results or distribute malicious content. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score support a malicious classification.

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=conjugaison%20anglaise%20tableau%20pdf
    • http://tibalib.mavensmarket.com/uploads/1/3/1/4/131407921/rarabositeweva_pumivax.pdf
    • http://files.pinmetalup.com/uploads/1/3/0/9/130969548/7383251.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/75785887294.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/dibip.pdf
    • https://cdn.shopify.com/s/files/1/0459/2258/2679/files/chrono_trigger_rom_snes_espaol_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2641/files/zuroziwedunajuwu.pdf
    • https://cdn.shopify.com/s/files/1/0438/5685/5190/files/asma_en_adultos_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0438/8408/5416/files/tekubivogidiz.pdf
    • https://cdn.shopify.com/s/files/1/0444/3511/2103/files/probability_worksheet_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0430/1363/6259/files/naxopikovaverumiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/xikabiwepelaxemimavobasas.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/30435690970.pdf
    • https://cdn.shopify.com/s/files/1/0430/9945/5642/files/pumasufa.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_off000085b2.bin
d8e42e393f04af6910a357f53691d2d0f6550bad9ab51eddc0fc91ee320f419b
pdf-font-stream PDF embedded font (sfnt) at offset 0x85B2 5236 bytes
font_01_sfnt_off0000978e.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
pdf-font-stream PDF embedded font (sfnt) at offset 0x978E 1800 bytes
font_02_sfnt_off0000a01c.bin
9b628eddc4e4ea0f2ff1bd469607b177ffdfb11c5c21f49e53e82c06258c22ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xA01C 15828 bytes