Malicious PDF — malware analysis report

Static analysis result for SHA-256 da028d5911ef2511…

MALICIOUS

PDF

46.6 KB Created: 2020-08-04 11:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37a3fca8bd5946da823551b6c16c4d06 SHA-1: ec3d313ceac1e8d22b2f2b4f6c9b5c92eef9a6ad SHA-256: da028d5911ef2511abdcabee3012a0048468d2ab31a17c1594fccc64a189951a
152 Risk Score

Malware Insights

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

The PDF document contains a high density of embedded URLs, many of which are part of a link farm pointing to a redirector service. This suggests the document is designed to lure users to malicious websites, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=factores+psicologicos+en+la+obesidad+pdf
    • http://files.devilsadvocatenews.com/uploads/1/3/1/0/131069887/jimumifefutowuri.pdf
    • http://files.rhymeasylum.com/uploads/1/3/1/4/131406435/kunetobufolusaror.pdf
    • http://files.904lawyer.com/uploads/1/3/1/8/131858481/dasafisaretujefo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0736/0667/files/98397940804.pdf
    • https://cdn.shopify.com/s/files/1/0430/5197/4818/files/18466621949.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/43831360902.pdf
    • https://cdn.shopify.com/s/files/1/0437/5884/6109/files/kudexowar.pdf
    • https://cdn.shopify.com/s/files/1/0429/5252/3929/files/gasumofapuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/4591/0678/files/18607777680.pdf
    • https://cdn.shopify.com/s/files/1/0434/2166/3397/files/bipiziluwu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7684/5728/files/pet_insurance._co._uk_claim_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/9367/1590/files/tepogobegugidoxapas.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/zikovi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/79042815037.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6027/files/admonitions_of_ipuwer.pdf
    • https://cdn.shopify.com/s/files/1/0437/4619/7653/files/benozutubojopesova.pdf
    • https://cdn.shopify.com/s/files/1/0428/6627/8556/files/lonawiwukibuvaxidusogu.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_off000075d0.bin
8fd20dc4f7c9ce1ec8fa65de0c2526b7cd10b5eb59419e8dd5992d57297be163
pdf-font-stream PDF embedded font (sfnt) at offset 0x75D0 5420 bytes
font_01_sfnt_off00008845.bin
5a3543041b0e411523c585f4d69c50e7be7a393fb4fe8553ba3f1eea661534e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8845 10772 bytes