Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0d42701946f17e…

MALICIOUS

PDF

42.8 KB Created: 2020-08-22 12:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bf18a62956a48ee235bae93721556b0 SHA-1: 2ed0e26a5d1794d1235ba05ed148893da8d41ad6 SHA-256: 1b0d42701946f17e1b2fdb00067fee63eedfbb3e998e467b2c35e1baf4a40d26
152 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. The document body, though partially corrupted, suggests a lure related to 'daily express quick crossword answers'. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector URL indicates an attempt to lead the user to a malicious site, 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.com/pify?keyword=daily+express+quick+crossword+answers
    • http://siven.dontworryaboutme.com/uploads/1/3/1/3/131378950/magusesewemido-gaxisuravewur-mukonurar-zoxolikuweriwa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/mijoputugatiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/1060/5735/files/zawudasawikuxebupubes.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/fipipu.pdf
    • https://cdn.shopify.com/s/files/1/0441/2293/1352/files/36767047323.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0810/files/98005669542.pdf
    • https://cdn.shopify.com/s/files/1/0435/7970/3451/files/cheri_cheri_lady_song_320kbps.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/91281209940.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/programa_arquitectonico_de_un_mercado.pdf
    • https://cdn.shopify.com/s/files/1/0439/0957/8907/files/todebetofej.pdf
    • https://cdn.shopify.com/s/files/1/0427/7351/2359/files/ruseniga.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_off0000683d.bin
f22da7220f39157d15eaf0e4611ac703483fd7b07735fc5e1f5830b0fb52138c
pdf-font-stream PDF embedded font (sfnt) at offset 0x683D 5520 bytes
font_01_sfnt_off00007b28.bin
d7856b75e82bca1fc60804adc7f7d6a79218411591a67374b190f0d537638e11
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B28 10340 bytes