Malicious PDF — malware analysis report

Static analysis result for SHA-256 1853d14bab4b81c5…

MALICIOUS

PDF

31.9 KB Created: 2020-08-24 04:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4046105432e3ff720076620f2ca1600c SHA-1: 581f48eace42a3edf7190004e0835980fafda124 SHA-256: 1853d14bab4b81c51fd6f118234053eda2e8f99b120fa0b2480d6bafe28ae901
174 Risk Score

Malware Insights

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

The PDF is identified as a malicious redirector and link farm, containing numerous external links. The document body, though obfuscated, contains a URL that matches a critical heuristic firing, indicating it's designed to lead users to malicious infrastructure. The presence of a screenshot lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 31 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=chapter+12+forces+and+motion+study+guide
    • http://rumega.laquintonholliday.com/uploads/1/3/2/6/132695306/jekikizi_suxim.pdf
    • http://dunibusix.theworldofboden.com/uploads/1/3/0/7/130739290/wunupokuwabojegikizi.pdf
    • http://figoxowuv.centerforhealthydevelopment.org/uploads/1/3/1/1/131163599/gegesewid.pdf
    • http://xorix.lifelonglearningpath.com/uploads/1/3/2/8/132816117/5810501.pdf
    • http://files.darajafoundation.com/uploads/1/3/1/4/131483279/5f69d3ec7f5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/puterelabigeromuxow.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6940/files/22188896459.pdf
    • https://cdn.shopify.com/s/files/1/0434/6950/4662/files/moviebox_ios_10_no_jailbreak.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/discord_overlay_obs.pdf
    • https://cdn.shopify.com/s/files/1/0434/6245/9544/files/60734973262.pdf
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/tiluvatidabibitaputopasi.pdf
    • https://cdn.shopify.com/s/files/1/0440/1371/5606/files/gazujizogopaliwewodok.pdf
    • https://cdn.shopify.com/s/files/1/0465/2685/7374/files/a_train_9_v4_0.pdf
    • https://cdn.shopify.com/s/files/1/0435/5280/0929/files/seismic_performance_level_rating.pdf
    • https://cdn.shopify.com/s/files/1/0448/0273/6279/files/linear_algebra_problems_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/partition_beyonce_mp3.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_off000044c9.bin
3289ee7c55b1d4081fc7871de30297424437094dfcbbc826ab0e789a6e2295d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44C9 5728 bytes
font_01_sfnt_off0000582b.bin
bef3830480ea57869117924b7bca29f1d0dd02a3483bf501a24c0776fc9b3b9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x582B 7780 bytes

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