Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdc312739680404…

MALICIOUS

PDF

56.3 KB Created: 2020-08-10 05:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 306f277d0b589374f653c5f373b139e5 SHA-1: 9edf5280a9ab41e9d6da8d34591e5537d01d38c3 SHA-256: 3fdc312739680404670378b8ee080a4537ae32af654b949ea349a16e8abe451d
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though partially corrupted, includes the URL 'https://ttraff.ru/pify?keyword=affinity+chromatography+principle+and+application+pdf', suggesting a lure to a malicious site. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm 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.ru/pify?keyword=affinity+chromatography+principle+and+application+pdf
    • http://rebumu.friendswoodvolleyball.com/uploads/1/3/2/3/132303382/liwejaziwokolo-wewuvimivez-puzesitob-tapidajetomibe.pdf
    • http://files.gwendolyndanielsmusic.com/uploads/1/3/1/4/131437413/6830415.pdf
    • http://files.judithersko.com/uploads/1/3/0/9/130969830/munape.pdf
    • http://files.solitlife.net/uploads/1/3/2/6/132681851/pisinoxufu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/88579132829.pdf
    • https://cdn.shopify.com/s/files/1/0432/7427/2924/files/44429154003.pdf
    • https://cdn.shopify.com/s/files/1/0434/3873/5512/files/fagopewanazudozub.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/87032348577.pdf
    • https://cdn.shopify.com/s/files/1/0431/5352/2850/files/vegumipetoxoxizaju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71482320097.pdf
    • https://cdn.shopify.com/s/files/1/0431/2170/5124/files/fibovapevese.pdf
    • https://cdn.shopify.com/s/files/1/0437/7935/8869/files/champs_behavior_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/1818/2041/files/43920302454.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/51757508704.pdf
    • https://cdn.shopify.com/s/files/1/0440/7495/9000/files/nugumuxedixuvati.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/86324663033.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/vowogasunulubeviri.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_off0000912d.bin
f07ce76f9b74a595d61130e7d3e92cce185af0e6c65cf69c9b96c1757d34b59b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x912D 5268 bytes
font_01_sfnt_off0000a2e5.bin
1cb50c1e5ea526c70bd1ba4bc7c94012424c520c8c29edb64a81dcf4b9ce8460		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2E5 9980 bytes
font_02_sfnt_off0000c4fb.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FB 4324 bytes

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