Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0f14beb512ce9b…

MALICIOUS

PDF

35.7 KB Created: 2020-08-17 16:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c792327807d7ae49020f13e3b7bde68b SHA-1: 7862d820413869bb74a77b2d61f55852f2abdbc4 SHA-256: 4b0f14beb512ce9b30cadd5a56bc0c2215bfbb0c4108671b63351c88e2ff3e6c
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains the primary malicious URL, which is designed to redirect users to further malicious content. The presence of numerous external links, many hosted on seemingly unrelated domains, suggests a coordinated effort to distribute malicious payloads or conduct phishing.

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/pify?keyword=dvd+electoral+dysfunction+answers
    • http://bewasozur.pamelameans.com/uploads/1/3/0/9/130969352/tarakomadi.pdf
    • http://buvelazan.espaciogallery.com/uploads/1/3/1/3/131384778/mifamagaluvek.pdf
    • http://files.coburghighhistorical.org/uploads/1/3/1/6/131607712/texagopijikiro-pelaxawotiwez.pdf
    • https://cdn.shopify.com/s/files/1/0431/5778/2694/files/beden_dili_kutsal_kitab_judi_james.pdf
    • https://cdn.shopify.com/s/files/1/0429/0304/4263/files/19907356974.pdf
    • https://cdn.shopify.com/s/files/1/0434/4286/4289/files/leronanajipezogudin.pdf
    • https://cdn.shopify.com/s/files/1/0436/0772/0094/files/sobunuwufufafanip.pdf
    • https://cdn.shopify.com/s/files/1/0433/1667/4713/files/mumanolagawodaponiwixo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2362/8450/files/nefejirutat.pdf
    • https://cdn.shopify.com/s/files/1/0431/1302/1607/files/rudojuwurefawosisabux.pdf
    • https://cdn.shopify.com/s/files/1/0440/4396/0485/files/cardiologia_clinica_guadalajara.pdf
    • https://cdn.shopify.com/s/files/1/0430/3201/9097/files/denitemazudo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6229/5714/files/tumik.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d99.bin
dd3d82cd9b2ef5cfeb9fac34f9493d7a1f016ce82285cefb94ebde321742b32c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D99 5268 bytes
font_01_sfnt_off00005faf.bin
4d4da4784f9f69b2e08306a734cb663e79df9d920a3792abbce1aeec3a44ba64
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAF 10112 bytes