Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dddc19b6e87513d…

MALICIOUS

PDF

39.8 KB Created: 2020-08-08 00:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ecdfbee66316c4677e59a2777208298 SHA-1: 6c1bdf10d829adb83033361c5d3f2e76850ae2c5 SHA-256: 1dddc19b6e87513d4035f8428c61503f9e4a49137cdaffe6faa447996be1a009
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with many links pointing to Shopify domains, but one critical link redirects to a known malicious URL. The document body text and embedded URLs suggest a lure for free PDF downloads, which is a common tactic for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=arihant+all+in+one+english+class+10+pdf+download+free
    • http://files.lovebugny.com/uploads/1/3/0/8/130813413/watazatir-riwoxefitumekum-dupafujonub.pdf
    • http://rowowi.vvsalesteam.com/uploads/1/3/1/4/131406082/32798c6.pdf
    • http://files.stjohnsumcla.org/uploads/1/3/1/3/131381078/08189d15d9.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/apricon_ez_gig.pdf
    • https://cdn.shopify.com/s/files/1/0430/2697/2825/files/pinopemaxipebarub.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3708/files/nabevater.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3370/files/the_sirius_mystery_robert_temple.pdf
    • https://cdn.shopify.com/s/files/1/0440/3026/3446/files/19417565067.pdf
    • https://cdn.shopify.com/s/files/1/0437/4904/8474/files/91747107365.pdf
    • https://cdn.shopify.com/s/files/1/0434/2903/6199/files/lavukafuduzibadipezu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9647/1707/files/ligoxefisadigokibetep.pdf
    • https://cdn.shopify.com/s/files/1/0428/5287/6455/files/sumunepipom.pdf
    • https://cdn.shopify.com/s/files/1/0433/7444/4694/files/baby_animals_names.pdf
    • https://cdn.shopify.com/s/files/1/0435/3458/1911/files/cooking_calc_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/gomer.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/watch_mad_men_online.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_off000059b4.bin
a4880fca233d0229c6a7760e5cbade19362d933ab7d938c3bc8d5fb112dd0d48
pdf-font-stream PDF embedded font (sfnt) at offset 0x59B4 5692 bytes
font_01_sfnt_off00006d23.bin
40e1a057db81ecf8ee55115e3b7499e029e029cc2b412c4550424772354e6b70
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D23 10148 bytes