Malicious PDF — malware analysis report

Static analysis result for SHA-256 b329bd9ac777a827…

MALICIOUS

PDF

64.4 KB Created: 2020-08-24 11:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8cabe719bb8e558be6e6d12c15cb62b SHA-1: ea40c34db706583ca55cf165552c480348a6ee8b SHA-256: b329bd9ac777a8276447e00ae3a256b73a52dbfcc5ef6bd7a9aa15a8b087a495
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at `ttraff.ru`. This suggests the document is designed to funnel users to malicious content, likely for phishing or malware distribution. The ML classifier strongly supports the malicious verdict.

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=haggadah+english+pdf
    • http://files.trinityjoppa.org/uploads/1/3/1/4/131409498/1148706.pdf
    • http://munela.thetemzreview.com/uploads/1/3/2/6/132681464/wovarogawe-tapak-firejevup.pdf
    • http://xotuxa.nomnomgelato.com.au/uploads/1/3/0/7/130740257/wugomafozur.pdf
    • https://cdn.shopify.com/s/files/1/0432/6703/1200/files/67948676205.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/sixth_grade_math_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7796/files/xivitave.pdf
    • https://cdn.shopify.com/s/files/1/0431/4877/1488/files/tuses.pdf
    • https://cdn.shopify.com/s/files/1/0436/1771/4338/files/lureveporibakumadesuzaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/5350/5946/files/3323529892.pdf
    • https://cdn.shopify.com/s/files/1/0433/5714/3199/files/tukazalikitarowumeviwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/20111445381.pdf
    • https://cdn.shopify.com/s/files/1/0433/4711/6197/files/kodevexisikugibinakow.pdf
    • https://cdn.shopify.com/s/files/1/0430/7560/0535/files/14325605848.pdf
    • https://cdn.shopify.com/s/files/1/0434/3490/1671/files/silent_planet_panic_room_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0437/9266/2688/files/4365477941.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/borrowed_words_a_history_of_loanwords_in_english.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_off0000b774.bin
f17291412779a1419cd76ac8e89de1074d65d3eeaa32ef9533f88fc5e6723244
pdf-font-stream PDF embedded font (sfnt) at offset 0xB774 5168 bytes
font_01_sfnt_off0000c901.bin
375001bd51aa334198b372d4b20ece2602af1fc7e056afc78a2aabd2b2de1625
pdf-font-stream PDF embedded font (sfnt) at offset 0xC901 12864 bytes