Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0fed8970051861…

MALICIOUS

PDF

112.5 KB Created: 2020-07-26 00:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41f75ca63f5af2c1e0232588658689e5 SHA-1: d4af7afb8552fc8fa2b9f27806f6a1e1e92fdbed SHA-256: 6a0fed89700518617a5f85b4b3d862ccb07a1a4e41fa6131b63f89437bb6d5c7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to lure users to external, potentially malicious, sites.

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.com/pify?keyword=migrationology+vietnamese+food+guide
    • http://files.bearsreg.com/uploads/1/3/0/8/130874641/kenono.pdf
    • http://files.stewartvillefire.com/uploads/1/3/1/4/131407698/ee4cee66ac09.pdf
    • http://files.allsaintslethbridge.org/uploads/1/3/1/4/131438098/sopopafazaze-dinukizosi.pdf
    • http://files.escaypeent.com/uploads/1/3/0/8/130814219/ledalagevow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7351/9269/files/bubavusoxaz.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/22574873351.pdf
    • https://cdn.shopify.com/s/files/1/0430/4896/0151/files/lejejepeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/movikulewerudazuxedo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5443/2410/files/10563469812.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/puxitodebis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1261535930.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/tinor.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3861/files/45052996777.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/84313532909.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5759/files/76621362759.pdf
    • https://cdn.shopify.com/s/files/1/0430/5820/0725/files/jemuvale.pdf
    • https://cdn.shopify.com/s/files/1/0430/4456/9242/files/zololovujufimoditunobas.pdf
    • https://cdn.shopify.com/s/files/1/0429/3636/9318/files/57326831530.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001746c.bin
47b522787b62cf6fd80938cd18fb5a005d4c060a0f0344da1d5e4a1365de8bcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1746C 5276 bytes
font_01_sfnt_off00018657.bin
e8491d1a4e62e0999e036e56ef64a762575301760d95dd828f893c7573c6ec26
pdf-font-stream PDF embedded font (sfnt) at offset 0x18657 17164 bytes