Malicious PDF — malware analysis report

Static analysis result for SHA-256 243565f88665a22d…

MALICIOUS

PDF

42.4 KB Created: 2020-08-08 03:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34f710b8d2ccca9d1fd99ce7a03cce06 SHA-1: 4fc2601fb11a562df61780cbdfa3320d175f5318 SHA-256: 243565f88665a22d0f290dfdc549ad37dc754560fc87bcd4ee631e18afd59ed1
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes a URL that points to known malicious infrastructure, suggesting a lure to a phishing or malware distribution site. The embedded links likely serve to artificially inflate search engine rankings for the malicious content.

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=collections+close+reader+grade+7+pdf
    • http://files.silversageffa.com/uploads/1/3/1/8/131872015/birimamimegizam.pdf
    • http://files.united-townfinancial.com/uploads/1/3/2/6/132696210/a2a174cfc.pdf
    • http://files.rosamiliafornjea.org/uploads/1/3/1/4/131408970/1520246.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/terraria_cooking_pot.pdf
    • https://cdn.shopify.com/s/files/1/0431/4398/7361/files/zoviriravezewuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9842/3967/files/sujadamiradu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/88887267137.pdf
    • https://cdn.shopify.com/s/files/1/0435/4605/0728/files/29996917366.pdf
    • https://cdn.shopify.com/s/files/1/0433/9807/0426/files/wumupisoxexogejizojuja.pdf
    • https://cdn.shopify.com/s/files/1/0430/5443/2410/files/53872102169.pdf
    • https://cdn.shopify.com/s/files/1/0439/9883/8942/files/temegufanosuzawuzido.pdf
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/8443962459.pdf
    • https://cdn.shopify.com/s/files/1/0433/8027/7406/files/74915835008.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/50445933069.pdf
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/55066387924.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_off0000650c.bin
1f20812aa21f5554a30545c5dc19abe5a9e287d367bd7a4569e054df3406078a
pdf-font-stream PDF embedded font (sfnt) at offset 0x650C 5308 bytes
font_01_sfnt_off00007731.bin
8b99c60a81079bbce8c3d1792707f1133f06982cb0d16e0e943849234d2577de
pdf-font-stream PDF embedded font (sfnt) at offset 0x7731 10936 bytes