Malicious PDF — malware analysis report

Static analysis result for SHA-256 a175abf26bdebd3d…

MALICIOUS

PDF

60.0 KB Created: 2020-08-18 19:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3581dd7a1869e1c6dad5c8431ea69677 SHA-1: 90952d3480c85b82be90240c986869e7154aa0b3 SHA-256: a175abf26bdebd3d8e663ab9eb9986521b777188d481fab44b28b7a330876cf3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a prominent link to `https://ttraff.com/pify?keyword=bulk+sms+software+for+pc`, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and mentions "Bulk sms software for pc", suggesting a lure. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

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=bulk+sms+software+for+pc
    • http://files.yolandamowens.com/uploads/1/3/1/0/131070560/79edbfa3af.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/4916605014.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2460/files/export_file_ke_word.pdf
    • https://cdn.shopify.com/s/files/1/0428/5438/3782/files/58402532446.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lewajoranuputefikilos.pdf
    • https://cdn.shopify.com/s/files/1/0449/3528/2856/files/99_bmw_323i.pdf
    • https://cdn.shopify.com/s/files/1/0437/6775/8999/files/the_way_i_are._mp3.pdf
    • https://cdn.shopify.com/s/files/1/0446/5616/5027/files/6th_grade_math_vocabulary_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/5488/3231/files/waxolufoz.pdf
    • https://cdn.shopify.com/s/files/1/0446/0825/8211/files/basic_math_101.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000097af.bin
a50a3fb6f3287fdbb102bddd19033918a817fd7ed22d225bda56b808a8599733
pdf-font-stream PDF embedded font (sfnt) at offset 0x97AF 5368 bytes
font_01_sfnt_off0000a9ef.bin
dda7442842047e5997c6c307d727efa23a2fdfa685817231df04fb19f6eea040
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9EF 10460 bytes
font_02_sfnt_off0000ce01.bin
f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE01 16144 bytes