Malicious PDF — malware analysis report

Static analysis result for SHA-256 523a73ea96d54601…

MALICIOUS

PDF

51.3 KB Created: 2020-08-04 23:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c2d783a4271246b50c7cc5b7c15c673 SHA-1: 6f3c07e6da74ecfc96d3f11c297200558af86714 SHA-256: 523a73ea96d546011c8ed197416630187129e7d522a2b6a3446f386e97cbe8b4
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to what appears to be a link farm hosted on cdn.shopify.com, with a primary redirector at ttraff.ru. This technique is commonly used to obscure the final malicious destination and evade detection. The ML classifier strongly indicated maliciousness, and the PDF structure itself suggests a malicious redirector.

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=makalah+tentang+bblr+pdf
    • http://files.chicagopcc.com/uploads/1/3/1/4/131410952/xokifiwo_wugewefava_jalele_nevij.pdf
    • http://files.greatervictoriaartistdirectory.com/uploads/1/3/1/8/131858108/movuxotabiwepa-zopotonufemajo-sevipufok-janegujixod.pdf
    • http://files.hayatsalukis.com/uploads/1/3/0/7/130775200/munuvevepiteromenipe.pdf
    • http://files.bagcharmboutique.com/uploads/1/3/2/6/132695492/962751.pdf
    • http://files.garageworksphotography.com/uploads/1/3/0/7/130775970/sisiwederafono.pdf
    • https://cdn.shopify.com/s/files/1/0437/6245/0586/files/56513357869.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/42268334499.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/af_931.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/sijasal.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7414/files/51084734309.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9165/files/ms_office_license.pdf
    • https://cdn.shopify.com/s/files/1/0428/5913/5132/files/nufetevagab.pdf
    • https://cdn.shopify.com/s/files/1/0429/1608/5923/files/45423946571.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/bupufoxilawikemun.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5887/files/1198440129.pdf
    • https://cdn.shopify.com/s/files/1/0437/5783/0298/files/34303747929.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3282/files/linear_alkyl_benzene_msds.pdf
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/pekefuwuxigeguwevesew.pdf
    • https://cdn.shopify.com/s/files/1/0437/1880/3605/files/sojuxufunufetetovofe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0913/8084/files/58692420059.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_off00008183.bin
3ea6e0e4d3b7d0f8b33d4793e23f30cc5ca07ecfc2695b02cb41cb8da563dde3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8183 1728 bytes
font_01_sfnt_off000089a0.bin
3fa895315546cf83d632253df10a28a29d61e169737cd742e69b583c2307dea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A0 5336 bytes
font_02_sfnt_off00009bc7.bin
4c9cdb25e78fe943d6c1f7f8854c2242ece37afda512c479bc829d8dfadad0d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC7 10396 bytes

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