Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc1ae4097cc88fb…

MALICIOUS

PDF

35.6 KB Created: 2020-05-25 03:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3148fb83b418fbab85931dfb80c67413 SHA-1: 4e54cfea76027a90264db15a4f2bac0907946857 SHA-256: 4bc1ae4097cc88fb0406ba3d89f05d906395a7e371e20689edefa7818dce826d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection tactic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains a URL that appears to be a lure for Turkish-dubbed content, which is likely a pretext to drive traffic to the malicious link farm. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://connectivityusa.net/uploads/1/3/0/4/130476778/130476778.html#b%25C3%25BCy%25C3%25BCk+ka%25C3%25A7%25C4%25B1%25C5%259F+4+sezon+t%25C3%25BCrk%25C3%25A7e+dublaj+izle
    • http://deedeelefrak.com/uploads/1/3/1/3/131381539/3882444.pdf
    • http://cornerstonejkc.com/uploads/1/3/0/3/130312957/cd1cc60733a.pdf
    • http://abodebuyer.com/uploads/1/3/0/4/130483583/julonusubolalaj.pdf
    • http://commonpeopleworkshop.org/uploads/1/3/0/6/130639599/3196748.pdf
    • http://annandaubrey.com/uploads/1/3/0/6/130604011/suzipo-jubijor-wesogebuzaju.pdf
    • http://truedoctrineofchrist.org/uploads/1/3/0/4/130483805/jogod_lemobugubido_kitud_savavozusasipur.pdf
    • http://fallowfieldmarketing.com/uploads/1/3/0/6/130620584/rilulunolubexewek.pdf
    • http://black-ventures.com/uploads/1/3/1/0/131070521/2d8daec11aba.pdf
    • http://jawilco.com/uploads/1/3/1/4/131407357/vogopisovar_gaxomolefu_tipalapuwijimi_zalogox.pdf
    • http://coombesandgabbie.com/uploads/1/3/0/6/130639220/2569537.pdf
    • http://jacohorn.com/uploads/1/3/1/6/131606697/fefowo.pdf
    • http://australiatyres.com/uploads/1/3/0/8/130814636/bididotomenuf_sezawurosoveje_dopujepikokugu_doruvituve.pdf
    • http://chauffeurdrivenlondon.com/uploads/1/3/0/7/130738830/1070515.pdf
    • http://almondcakesandcatering.com/uploads/1/3/0/8/130814179/wegirup.pdf
    • http://riskyaccessory.com/uploads/1/3/0/2/130270873/5195885.pdf
    • http://lions-transport.com/uploads/1/3/0/6/130620380/kibumekonexani_bovuge.pdf
    • http://fitvangelist.net/uploads/1/3/0/5/130551356/990330.pdf
    • http://barceloseassociados.com/uploads/1/3/0/7/130740251/cdd83d9c.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ca4.bin
3c899d40f697ab71da8c2452628b4fa34d4cce84df61c9ee5114ec7b30f67c05
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA4 11392 bytes