Malicious PDF — malware analysis report

Static analysis result for SHA-256 88af3faccb05561e…

MALICIOUS

PDF

50.1 KB Created: 2020-09-01 05:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1840591304961c81c2e1aa4164182a24 SHA-1: bb2386ccee00be7e7f8d7417be72cbc481b5aa63 SHA-256: 88af3faccb05561e658d3ca1c009942be60e93e8db7800f34acc521dbd6e03d6
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to a "Japan tour guide book pdf". The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/wix?keyword=japan+tour+guide+book+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9279/5801/files/surupalitotomenuparabin.pdf
    • https://cdn.shopify.com/s/files/1/0450/7946/2040/files/html_to_library_python.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5814/files/pabewopawagineniz.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/16171064830.pdf
    • https://static.usrfiles.com/ugd/48f461_cd169ef39c2b4576b6f2a366827ceeca.pdf
    • https://cdn.shopify.com/s/files/1/0433/7231/4778/files/93491841.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2315/files/st_caste_list_in_bihar_2018.pdf
    • https://cdn.shopify.com/s/files/1/0439/6492/4062/files/jafipeletazenuxefomew.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5622/files/noun_verb_adjective_list_bac.pdf
    • https://cdn.shopify.com/s/files/1/0433/3135/4774/files/also_sprach_zarathustra_score.pdf
    • https://cdn.shopify.com/s/files/1/0433/3391/0681/files/avicii_without_you_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/vivino.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6941/files/96276646142.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_off000087a0.bin
ca484c9b9f7f86d0bf7453ac13ae0b994c9ff234de75e12e9256ecb6edec5a4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x87A0 5192 bytes
font_01_sfnt_off0000995e.bin
77acfcd3d014168df7112fae37c06b55bd604111e982e8fba2e626eadb5e3cbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x995E 10120 bytes