Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a3836b9e152cfa…

MALICIOUS

PDF

41.2 KB Created: 2020-08-31 03:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16bf8bbffb311fdf8a027764d0e12277 SHA-1: 68947f4d9b27b1fd7340a2b55850112895084d14 SHA-256: 40a3836b9e152cfaf06947a33f26a2e462da67927fa17a9ef6204fe2201b1811
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a movie download, which is a common lure for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and references to movie downloads, reinforcing the lure. The presence of numerous other PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to increase visibility.

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/wix?keyword=bajirao+mastani+full+movie+hd+download+720p
    • https://cdn.shopify.com/s/files/1/0430/2798/8634/files/anthonomus_grandis.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2695/files/cloudformation_template_parameters_file.pdf
    • https://cdn.shopify.com/s/files/1/0432/9612/9192/files/jasovafoveloxasu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6739/9575/files/anker_soundcore_bluetooth_speaker_review.pdf
    • https://cdn.shopify.com/s/files/1/0439/6479/2990/files/1963607979.pdf
    • https://cdn.shopify.com/s/files/1/0438/4702/4805/files/mezogozivusivitegovim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0956/4064/files/79649972252.pdf
    • https://cdn.shopify.com/s/files/1/0432/1958/3138/files/create_analog_clock_widget_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7637/files/37709958053.pdf
    • https://cdn.shopify.com/s/files/1/0434/9476/8792/files/behavioral_disorders.pdf
    • https://cdn.shopify.com/s/files/1/0437/8161/9861/files/bakubifivoboj.pdf
    • https://cdn.shopify.com/s/files/1/0434/4374/9029/files/15298563108.pdf
    • https://static.usrfiles.com/ugd/ac51ce_53d96ae3a49f4ca9b8f507bf3289aa12.pdf
    • https://static.usrfiles.com/ugd/b8c837_66775c8e62984023ab82d7d576558559.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_off0000603c.bin
bbcfe9f9920ae446240a8b061285bc78bfe215e5679e5820a993836b825b8d28
pdf-font-stream PDF embedded font (sfnt) at offset 0x603C 5912 bytes
font_01_sfnt_off0000744f.bin
3d79f4349baad5abb16e70bacb93cae7905423ce1a5722f6fad7ae2b1e9eb515
pdf-font-stream PDF embedded font (sfnt) at offset 0x744F 10584 bytes