Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f62a8d3d38bde69…

MALICIOUS

PDF

41.1 KB Created: 2020-08-20 09:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b65f8e1771f582f5273282efd2278c59 SHA-1: 89f35f9532d02e0315dcf3e64cf610dff3b06944 SHA-256: 0f62a8d3d38bde69660c1e7d8b64737040f108c3f63e3ef8b7ef53733b52b1df
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to a redirector service, indicating a link farm or phishing attempt. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest an attempt to lure users to malicious sites, likely for further exploitation or credential harvesting.

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.ru/pify?keyword=biryani+hd+making+video+songs
    • http://files.christopherscottmurillo.com/uploads/1/3/1/6/131637043/39cea656fc040.pdf
    • http://lirewalan.stjosephsballymun.com/uploads/1/3/1/4/131438610/lofulur_tupuvuxulilosi_nijijupizeb_warigamaka.pdf
    • http://fagore.chicagocitylimits.com/uploads/1/3/1/3/131383483/guviwijome-dunetebis-saxafuxotukimag.pdf
    • http://xuzenup.runninsranch.com/uploads/1/3/1/4/131437626/wikerepoviravabik.pdf
    • http://files.iagoarts.com/uploads/1/3/1/3/131381802/5c3a6df43156689.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/short_film_the_double_helix_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/7539/5993/files/how_to_summon_the_ender_dragon.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1029/files/78596802630.pdf
    • https://cdn.shopify.com/s/files/1/0434/3011/7526/files/77296072316.pdf
    • https://cdn.shopify.com/s/files/1/0434/2274/4741/files/68974770079.pdf
    • https://cdn.shopify.com/s/files/1/0440/3855/3765/files/42104848560.pdf
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/tcu_guide_book_2019_20_for_diploma.pdf
    • https://cdn.shopify.com/s/files/1/0433/9430/2115/files/13035687962.pdf
    • https://cdn.shopify.com/s/files/1/0433/7162/6652/files/lujeguga.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_off0000638c.bin
71dc78553c782a6695342765f8f333bafd4561e0ba52c906a1f6cc65de82c5b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x638C 5484 bytes
font_01_sfnt_off00007607.bin
d33e24c18651b4179ef6c1ba0b6bbe55a28aecfc86f9e59f0a2babf49180086e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7607 9784 bytes